HGM300 / RDM800 Refrigerant Gas Monitoring System Instruction 3015-4148 Installation / Operation / Maintenance Rev.
Notice: Product improvements and enhancements are continuous; therefore the specifications and information contained in this document may change without notice. Bacharach, Inc. shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of Bacharach, Inc.
Table of Contents TABLE OF CONTENTS ..................................................................................................................................................... I INTRODUCTION ............................................................................................................................................................. II SAFETY PRECAUTIONS....................................................................................................................................
Introduction How to Use This Manual Thank you for investing in a BACHARACH HGM300 Refrigerant Gas Monitor. This manual provides important information on how to install, operate, and service the HGM300 Refrigerant Monitor and RDM800 Display Module. Please read this manual carefully before use. If you have a working knowledge of refrigerant monitors, you will find this manual useful as a reference tool.
Safety Precautions AC Power Supply Ensure the source voltage matches the voltage of the product before energizing the equipment. It is highly suggested that the HGM300 be placed on a separate circuit with UPS or surge protection.
Safety Precautions (Cont.) Installation Category Installation Category II, Pollution Degree II, as defined by UL. Altitude Limit 2,000 meters Cleaning USE a dry cloth to clean the outside of the case. DO NOT use soap and water. Warning Statements The use of the word WARNING in this manual denotes a potential hazard associated with the use of this equipment.
Functional Overview General Description Refrigerant monitors are specified to support compliance to federal, state and local safety codes governing refrigerant emissions. Avoiding significant refrigerant loss reduces equipment replacement costs, maintains equipment efficiency, promotes safety, and protects the environment. The HGM300 provides for the continuous monitoring of refrigerant gas levels in up to 16 separate test zones.
The HGM300 should be centrally located in the mechanical room and be readily accessible for easy visual monitoring and servicing. Air sample tubing may be run in lengths up to 500 feet. The fresh air purge line should draw from an area that does not contain any refrigerant gas and cannot exceed 300 feet in length. The exhaust line should run to an out side location if possible. The length of the exhaust line cannot exceed 300 feet.
HGM300 Installation HGM300 Oblique Photo Upper & Lower Mounting Brackets LED Indicators Water Trap Upper Mounting Bracket LED Indicators Lower Mounting Bracket Water Trap STANDARD ACCESSORIES FOR A 4-POINT SYSTEM 5 Line-End Filters (P/N 3015-3420) Charcoal Filter & T-Bolt Bracket (P/N 3015-3125) HGM300/RDM800 Instruction Manual Instruction 3015-4148 1
HGM300 - Installation Considerations Locating the Monitor The HGM300 should be centrally located in the facility and should be easily accessible for visual monitoring and servicing. Intake sample lines can be up to 500 feet in length, but it is important to remember that sampling cycle time is proportional to the total number and length of individual sample lines. Dirt, grease, and oils can adversely affect the operation of the HGM300.
HGM300 - Mounting Instructions Screw Locations The HGM300 should be installed plumb and level and securely fastened to a rigid mounting surface. The enclosure utilizes keyhole mounting brackets designed for #12 pan head fasteners. Locate the four screws as shown in the diagram and leave the screw heads protruding approximately 3/16".
HGM300 - Connecting Air Lines Overview Individual sample lines are run from the HGM300 to each area of the facility to be monitored. Additionally, a purge line is installed to provide clean air for resetting the infrared zero baseline. An exhaust line is installed to vent residual gas away from the monitor. All air line connections are made on the left side of the enclosure as indicated in the photograph below.
Tubing Considerations Use ¼" outside diameter (0.040" wall) flex tubing for all air lines (P/N 3015-3235) or equivalent. The tubing should be clean and free of residual moisture or other contaminants. The tubing should be cut cleanly with a sharp knife and care should be taken not to distort the tubing end. To connect the air lines to the monitor simply push the tubing firmly onto the connector. All tubing bends should have a radius of no less than 5" to assure proper airflow.
HGM300 - Interior Schematic Primary Filter Intake Manifold Solenoids Intake Solenoid Connectors Power Supply Board Main Board Microcontroller Board Infrared Optical Bench Gas Sample Pump Primary Filter (P/N 3015-3071) Power Supply Board 120 or 240 VAC Determined by Sales Order Intake Manifold Solenoids Main Board Intake Manifold Solenoid Connectors Microcontroller Board Infrared Optical Bench Gas Sample Pump 6 Instruction 3015-4148
AC Power / RS-485 / Relay Connector / 4-20 mAdc Current Loop 4–20 mAdc Interface Board (Optional) AC Power ON/OFF Switch Dual 4-20 mAdc Outputs AC IN Connector T1 (Signal Out Only) DO NOT APPLY POWER! Location of AC Input Line Filter RS-485 Connector (240 VAC Units Only) Relay Connector Ground Stud Alarm 1, 2, 3, Fault Auxiliary AC Out Connector T2 (Used to Supply AC power to Alarm Devices) (Overload Protected by Fuse F3) Switches / Fuses F4 HGM300 Fuses F2 (Refer to Maintenance Section for v
HGM300 - Electrical Wiring It is highly recommended that the HGM300 be connected directly to the AC power source, preferably on its own circuit. The connection should be completed with a UL rated multi-conductor wire (14-18 AWG). Locate service knockouts on exterior of enclosure and install electrical conduit in the typical manner. The HGM300 is available in either a 120 or 240 VAC configuration. The unit’s AC voltage rating is marked on the outside of the enclosure.
HGM300 AC Input Power and Ground Connections Instruction 3015-4148 9
HGM300 - Connecting Communication Devices Remote Display Module (RDM800) Connection The HGM300 is connected to the RDM800 using a shielded twisted pair instrument cable. The maximum distance between the farthest away HGM300 and RDM800 is 4500 feet. Use any of the remaining service knockouts to gain access to the interior of the monitor. The RS-485 communication wiring between the HGM300 and RDM800 must be connected in the following manner: Locate the RS-485 connector in the HGM300 (Page 7).
Changing Terminator Switch Settings The terminator switch is shipped from the factory in the terminated or “IN” position. This is the correct setting if the HGM300 is connected as a single device, or it is the last device on the network chain. If the HGM300 is being installed in the middle of a network, the terminator must be moved to the “OUT” position. Locate the switch and determine its position. If it needs to be moved, slide the switch to the appropriate position.
Multiple HGM’s MULTIPLE HGM300’S WITH RDM800 TERMINATOR NOTE 1: The last HGM300 or RDM800 on either end of the network must have its terminator in the “IN” position, and all other units must have their terminators in the “OUT” position. “IN” RMD800 NOTE 2: The total length of the RS-485 cable cannot exceed 4500 feet. (Use instrument cable 20 gage multi-strand shielded and twisted pair – similar or equal to Belden cable #8762.
MULTIPLE HGM300’s CONNECTED TO A BUILDING MANAGEMENT SYSTEM DAISY CHAIN FASHION BUILDING MANAGEMENT SYSTEM RS-485 TERMINATOR “IN” HGM300 UNIT 1 NODE 1 TERMINATOR “OUT” HGM300 UNIT 2 NODE 2 HGM300 UNIT 3 NODE 3 TERMINATOR TERMINATOR TERMINATOR “OUT” “IN” “OUT” HGM300 UNIT 4 NODE 4 HGM300 - PC Software Programming the HGM300 Using PC Software NOTE 1: There are two versions of PC software. Use Version 1.0 with HGM300 units with v1.
7. Using the arrow keys go to EDIT; press ENTER – the EDIT Menu DROPS DOWN; select SYSTEM and then press ENTER – the HGM LOCATION becomes highlighted. Press ENTER to move to the HGM TAG area; use the BACKSPACE key to remove the existing tag; then enter in a new tag. Press ENTER to return to LOCATION. Use the ARROW key to select the next item to be addressed. Note that you cannot change the “SN” or “FIRMWARE” items. Press the ESC key to return to the menu bar. 8.
To Save and Print the HGM300 Software Screen, Alarm Log, Fault Log, or Diagnostic Screen Open the software while connected to the HGM300. After the software gets the program, open the desired screen. With that screen as the active screen, press the ALT and PRINT SCREEN keys on the PC keyboard. Open Microsoft Word; go to FILE, NEW; go to EDIT; then PASTE. The active screen is then brought into Word. To save the file, select SAVE AS; select the proper drive and file name; and then press SAVE.
HGM300 - Current Loop Interfaces Optional 4–20 mAdc Outputs Upon installation of the optional 4–20 mAdc Interface Board (Page 7) (P/N 3015-3133), the HGM300 has the capability of providing dual 4-20 mAdc scrolling current loop outputs for connection to external monitoring devices. The interfaces are set up as follows: Loop 1 indicates zone area Loop 2 indicates PPM Connection The external devices are connected to the HGM300 using a shielded dual twisted pair cable.
HGM300 - Connecting External Alarms Overview Each HGM300 includes 4, Form C, SPDT relay contacts for the connection of external alarm devices. The relays are factory assigned to the following conditions: Relay #1 Leak Relay #2 Spill Relay #3 Evacuate Relay #4 Fault Connection Use the AC conduit or any of the remaining service knockouts to gain cable access to the interior of the monitor. Locate the relay connector (Page 7) and remove it from the circuit board.
Typical HGM300 Relay 1 and Relay 2 Wiring LEAK SPILL EVACUATE FAULT Horn Aux. Power Neutral Line Neutral Line Strobe Main AC Input Jumper the ‘Neutral’ of the auxiliary power connector to the ‘Common’ on the relay block. Connect one end of strobe or horn to the ‘NO’ of whichever level of alarm is appropriate for application. The other end of strobe or horn is connected to the ‘Line’ of the auxiliary power connector (5 A max.).
RDM800 Installation RDM800 Oblique Photo Upper & Lower Mounting Brackets Upper Mounting Bracket Lower Mounting Bracket Instruction 3015-4148 19
RDM800 - Installation Considerations Overview Up to four HGM300 monitors may be connected to a single RDM800. The RDM800 can be located anywhere up to 4500 feet from the furthest HGM300. The display module should be installed out of direct sunlight in a clean area that is not subject to temperature or humidity extremes. WARNING – Drilling holes in the HGM300 and RDM800 enclosure will void the warranty. Please use knockouts provided for electrical connections.
RDM800 - Mounting Instructions Screw Locations The RDM800 should be installed plumb and level and securely fastened to a rigid mounting surface. The enclosure utilizes keyhole mounting brackets designed for #12 pan head fasteners. Locate the four screws as shown in the diagram and leave the screw heads protruding approximately 3/16".
RDM800 - Interior Schematic Microcontroller Board CPU Reset Switch Main Board Ground Stud AC Power Microcontroller Board CPU Reset Switch Power Supply Board 120–230 VAC Input Main Board AC IN Connector T3 Front Panel 22 Chassis Instruction 3015-4148
AC Power RS-485 Connectors Terminator Switches Relay Connector Fuses 1 Amp 250 VAC P/N 3015-4011 Terminator Switches F2 F1 Instruction 3015-4148 TO MONITORS TO HOST RS-485 to HGM300 Monitors RS-485 to Building Management System Relay Connector AC IN Connector T3 23
RDM800 - Electrical Wiring It is highly recommended that the RDM800 be connected directly to the AC power source, preferably on its own circuit. The connection should be completed with a UL rated multi-conductor wire (14-18 AWG). Locate service knockouts on exterior of enclosure and install electrical conduit in the typical manner. The RDM800 is available in either a 120 or 230 VAC configuration. The unit’s AC voltage rating is marked on the outside of the enclosure.
RDM800 AC Input Power and Ground Connections Instruction 3015-4148 25
RDM800 - Communication Connections HGM300 Network The RDM800 Display Module is connected to the HGM300 network using a shielded twisted pair cable. The maximum distance between the RDM800 and the farthest HGM300 is 4500 feet. Use any of the remaining service knockouts to gain access to the interior of the RDM800. The RS-485 communication wiring between the RDM800 and HGM300 must be connected in the following manner: Locate the RS-485 connector marked “TO MONITORS” in the RDM800 (Page 23).
Changing Terminator Switch Settings The terminator switch for the RS-485 “TO MONITORS” connector is shipped from the factory in the terminated or “IN” position. This is the correct setting if the RDM800 is connected to only one HGM300, or if it is the last device on a network chain. If the RDM800 is being installed in the middle of a network, the terminator must be moved to the “OUT” position. Refer to Multiple HGM's on Page 12.
RDM800 - Connecting External Alarms Overview Two SPDT relays are available for the connection of external alarm devices. These alarms are useful for alerting the user to global conditions anywhere on the network. Each relay can be programmed to respond to alarm, fault, or ready conditions (refer to Setting Relay Parameters on Page 36). Connection Use the AC conduit or any of the remaining service knockouts to gain access to the interior of the RDM800.
RDM800 Operation RDM800 Exterior Schematic Display Screen Navigation Buttons Cursor Pad LED Indicators Navigation Buttons LED Indicators Instruction 3015-4148 Display Screen Cursor Pad 29
RDM800 - Overview The RDM800 displays comprehensive information about the HGM300 network status and enables complete programming control of all system operations. The prominent features of the display module are discussed below. Display Screen The display screen is a back-lit LCD. Control Keys The 4 keys on each side of the display window are used to navigate between screen displays. A graphic box open to the edge of the window indicates that the adjacent control key is active.
RDM800 - Screen Displays When first powered up a splash screen appears indicating the serial number and firmware revision number. After a brief moment the System Screen is displayed. Please refer to the Appendix for a logic diagram of all the screen displays. There is a 15-minute warm-up period after power is first applied. Under “HGMS”, "WARM UP" is displayed. The green indicator on the HGM will blink during the warm-up period. IMPORTANT: DO NOT plug the gas-sample hose or inlet port of any zone.
RDM800 - System Programming Setup Parameters Before working with the HGM300 network, several global parameters must be defined. Most of these are entered in the RDM Setup Screens or via the PC software. Parameters must also be defined for each HGM300 monitor connected to the network. These settings serve to identify each monitor and define how they operate. These are entered in the HGM Setup Screens. Finally, parameters must be defined for each individual monitoring zone.
RDM800 - Setup Programming Setting the Clock From the top level System Screen press the key adjacent to the date/time field to go to the Clock Setup Screen. Clock Setup Screen Use the LEFT/RIGHT cursor keys to move the cursor across the field to the value you wish to edit. Use the UP/DOWN cursor keys to modify the field value and press the ENTER key to accept your entries.
Navigating to the 1st RDM Setup Screen From the top level System Screen press the RDM SETUP key to go to RDM Setup Screen #1. RDM Setup Screen #1 Contrast This value sets the screen brightness. 1. Press the adjacent key to adjust the setting. 2. Use the UP/DOWN cursor keys to modify the setting. 3. Press ENTER to accept the new entry or QUIT to revert to the previous setting. Number of HGM Units This is the number from 1-4 of HGM300 monitors connected to the RDM800. 1.
Audible Alarm This parameter selects the function of the RDM800’s internal audible alarm. 1. Press the adjacent key to adjust the setting. 2. Use the UP/DOWN cursor keys to select unused, monitor on, evacuate, spill, leak, fault, or alarm. 3. Press ENTER to accept the new entry or QUIT to revert to the previous setting. Enabling Building Management System Connection This enables or disables the connection to a Building Management System. 1. Press the adjacent key to adjust the setting. 2.
Navigating to the 2nd RDM Setup Screen From RDM Setup Screen #1 press the MORE key to go to RDM Setup Screen #2. Press the BACK key to return to RDM Setup Screen #1. RDM Setup Screen #2 Setting Relay Parameters This setting determines the function of relays 1 and 2 mounted inside the RDM unit. 1. Press the key adjacent to the relay parameter you want to adjust. 2. Use the UP/DOWN cursor keys to select unused, monitor on, evacuate, spill, leak, fault, or alarm.. 3.
HGM300 - Setup Programming Navigating to the 1st and then 2nd HGM Setup Screen From the System Screen press the key adjacent to the target HGM300 to go to that unit’s HGM Setup Screen #1. HGM Setup Screen #1 From HGM Setup Screen #1 press the SETUP key to go to HGM Setup Screen #2. Press the QUIT key to return to the System Screen.
Location This is the name you assign to the HGM300 to identify its location. It may have up to 12 alphanumeric characters. 1. Press the adjacent key to adjust the setting. 2. Use the LEFT/RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys to modify the individual characters. 3. Press ENTER to accept the new entry or QUIT to revert to the previous setting. Number of Zones Installed IMPORTANT: Do not change the number of zones to deactivate excess zones.
Loop2 Factor This sets the PPM scale factor for current loop number 2. To calculate the current output, multiply the scale factor by the PPM and add 4. For example, at the default scale factor of 0.016, a measurement of 100ppm would generate a current output of 5.6 mAdc. In no case can current output exceed the 20 mAdc capacity of the interface. 1. Press the adjacent key to adjust the setting. 2.
Navigating to the 3rd HGM Setup Screen From HGM Setup Screen #2, press the MORE key to go to HGM Setup Screen #3. Press the BACK key to return to HGM Setup Screen #2. HGM Setup Screen #3 Service Timeout Sets the length of time the Service Mode is in effect. Stops the monitor for up to 240 minutes (4 hrs) to allow for servicing the unit. Refer to Service Mode on Page 62. 1. Press the adjacent key to adjust the setting. 2.
RDM800 - Zone Setup Programming Navigating to the 1st Zone Setup Screen There are two ways to display Zone Setup Screen #1: • From the System Screen (Page 31) press the key adjacent to the HGM300 unit associated with the zone you wish to work with; press the ZONES key; and then press the key adjacent to the desired zone. • From the top level Zone Screen (Page 44) press the key adjacent to the zone you wish to work with.
Average Temperature This temperature reading may be changed to the exact temperature at the sample point for greater accuracy. The adjustment range is from –50 to +70 degrees C. 1. Press the AVG TEMP key to adjust the temperature value. 2. Use the LEFT/RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys to modify the setting. 3. Press ENTER to accept the new entry or QUIT to revert to the previous setting.
Spill Level This is the concentration level in PPM that will activate a spill alarm condition. 1. Press the adjacent key to adjust the value. 2. Use the UP/DOWN cursor keys to modify the setting. 3. Press ENTER to accept the new entry or QUIT to revert to the previous setting. NOTE: This value must be less than the evacuate level and greater than the leak level. Evacuation Level This is the concentration level in PPM that will activate an evacuate alarm condition. 1.
General Operation Functional Overview Normally each HGM300 will sequentially perform measurements on its active zones without user input. The total time it takes an HGM300 to complete a measurement cycle is directly proportional to the number of active zones and the physical length of the air lines. Monitors linked together on a network operate independently of each other and consequently complete their respective measurement cycles at different rates.
Zone Hold Mode A zone can be placed on hold and continuously monitored for a length of time determined by the Zone Hold Time value (Page 38). To place a zone on hold, press and hold down the key adjacent to that zone until you hear a beep. The word “HOLDING” appears to identify which zone is being held. Zone Screen (Hold Mode) Zone on Hold Once in the hold mode you can further investigate the status of the zone by pressing the adjacent key and going to that Zone’s Setup Screen #1 (Page 41).
If the current Zone Screen appears normal, scroll through the displays using the NEXT/BACK keys or the UP/DOWN cursor keys until you locate the affected zone. You can further investigate the status of the affected zone by pressing the adjacent key and going to that Zone’s Setup Screen #1 (Page 41). You may also press the ALARMS key to go directly to the Alarm Summary Screen (Page 50). Refer to Working with Alarms on Page 50 to learn more about responding to alarms.
Working with the System Screen The System Screen provides a summary view of the entire HGM300 network. The boxes on the left side of the screen indicate the status of each HGM300 monitor including the name, the current zone, and whether fault or alarm conditions are present on the network. System Screen Alarm Conditions When an alarm condition is detected anywhere on the network the red ALARM LED will glow.
Alarm Log From the System Screen press the key adjacent to the HGM300 unit that you wish to view. HGM Setup #1 Screen Press the ALARM EVENT LOG key to display the Alarm Log Screen. Alarm Log Screen Use the LEFT/RIGHT and UP/DOWN cursor keys to move through the log. The Alarm log shows the last 20 alarm events. An alarm event is the occurrence of any alarm, any change in alarm level, or the clearing of any alarm. The alarm level is indicated by an L (leak), S (spill), or E (evacuate).
Fault Conditions If a system malfunction occurs, the yellow FAULT LED will glow. Additionally, an external alarm device may activate and an audible alarm may sound if those features have been enabled (Pages 28 & 35). The FAULTS box on the right of the screen will blink and then counts the number of HGM units on the system with a fault. To investigate a fault, press the FAULTS key to go to the Fault Screen (Page 54).
Working with Alarms Functional Overview If the PPM level for any zone exceed its designated spill, leak, or evacuate thresholds, an alarm condition will be created. Once the HGM300 completes a measurement cycle in the affected zone the alarm condition will be indicated. At that time the red ALARM LED on the HGM300 will glow. Additionally, an external alarm device may activate and an audible alarm may sound if those features have been enabled (Pages 17 & 38).
Alarm Detail Screen To further investigate an alarm, press the adjacent key to go to the Alarm Detail Screen.
Acknowledging Alarms Each pending alarm may require, depending upon selected alarm mode, acknowledgment before the system returns to normal operation (refer to Alarm Ack Mode on Page 38). To acknowledge an alarm, navigate to the Alarm Detail Screen and press the ACK key as previously described. You will then be returned to the Alarm Summary Screen and the box associated with that alarm will no longer be blinking, indicating that the alarm has been acknowledged.
Working with the Trend Screen Overview - Log Interval The HGM300 retains a data log of 100 measurements for each zone. The log interval is the number of minutes from 1 to 1440 between each log point. This parameter can be changed from Zone Setup Screen #1 (Page 41). The default setting for this parameter is 1440 minutes (24 hours). If the log interval time is set to 0, then a measurement is recorded in the trend log after every measurement cycle.
Working with System Faults Functional Overview If a system malfunction occurs, the HGM300 will detect the problem and cause its yellow FAULT LED to glow. Additionally, an external alarm device may activate and an audible alarm may sound if those features have been enabled (Pages 17 & 38). The next time the RDM800 polls the affected monitor its yellow FAULT LED will also glow.
CRITICAL FAULTS • NO FLOW ON ZONE – Go to the System Screen (Page 31) and press the ZONES key. The Zone Screen will display a “NO FLOW” message in each individual zone affected. Check for a blockage in the air sample line or at the line end filter. Once the blockage has been cleared, the HGM300 will return to normal operation after the zone has been sampled. NOTE: This can take some several minutes since it is dependent upon how many zones there are and their lengths.
Clearing System Faults If the fault condition is associated with an HGM300, the monitor will return to normal operation soon after the problem is corrected. At that time the YELLOW LED will turn off and any external alarms connected to the monitor’s alarm relays will also turn off. The RDM800 will return to normal operation the next time it polls the affected HGM300 monitor. Once the system malfunction has been corrected it may take some time for the fault condition to clear completely.
Working with the Calibration Screen Overview The Calibration Screen is used to adjust the calibration factor for each refrigerant gas. It is also used to program the instrument for new gasses. IMPORTANT: Changing information on CAL FACTORS will VOID the factory calibration. Typically, the unit will remain within the factory-calibrated accuracy indefinitely and no calibration is required.
Calibration Procedure The CAL FACTOR is determined by sampling a known dilution of the type of refrigerant gas to be sampled. The sample must be prepared to less than half the desired accuracy, and the concentration must be corrected for ambient temperature and pressure at the time of measurement. Calibration is best performed at or near full scale (1,000 PPM). It can, however, be done at any concentration, and ideally in the range where maximum accuracy is desired down to, but not below, 100 PPM.
Programming New Gasses As new refrigerants come into use the HGM300 allows the addition of these new gases to its on-board refrigerant gas library. At the end of the gas library list are five place-holders for adding new gases. They are labeled “NEW GAS1 – NEW GAS5.” From the Calibration Screen a place-holder for the new gas is selected and renamed to the desired refrigerant type. Next a “matching” refrigerant from the standard library is selected and a CAL factor is entered.
Working with the Diagnostic Screen Overview The Diagnostic Screen displays reference values for use by repair technicians for troubleshooting purposes. Navigating to the Diagnostic Screen Display the System Screen (Page 31); press the key adjacent to the target HGM300 unit to go to that monitor’s HGM Setup Screen #1 (Page 37); and then press the DIAG key to go to the selected monitor’s Diagnostic Screen.
LINE 7: PPM – Parts Per Million is the volume concentration referenced to standard temperature and pressure and is computed from lines 5, 8 and 13. There are two figures given. The first (annotated by a B) is the actual PPM at the IR bench. The second is a PPM reading normalized to standard temperature and pressure. LINE 8: Zero Temperature – This line contains the sensor and enclosure temperature measured and stored during the last purge cycle in degrees C.
Service Mode When activated, the Service Mode will disable a specific HGM300 unit for a specified length of time. The default is 60 minutes. This time interval can be changed as described under the heading Service Timeout on Page 40. IMPORTANT: Note that while in the Service Mode no measurements are made, nor are any alarms activated. From the System Screen (Page 31), select the key adjacent to the HGM unit you wish to place into its Service Mode.
Appendix Instruction 3015-4148 63
HGM300 / RDM800 Maintenance WARNING - Always remove AC input power to the monitor before working inside the instrument. CAUTION - When working inside the instrument be very careful not to dislodge any electrical wiring or pneumatic tubing. The HGM300 contains sensitive electronic components that can be easily damaged. Be careful not to touch or disturb any of these components. Servicing Primary Filter Locate the inline filter (P/N 3015-3071) (Page 6) and inspect it for obvious signs of contamination.
Optional Accessories Intake Manifolds Up to three additional intake manifolds (P/N 3015-3419 & 3015-3411) can be installed in the HGM300 to increase the total capacity to 16 zones. Each manifold requires a sample line end filter for each of the 4 zones. Please follow the instructions provided to install the manifolds. Then follow the instructions earlier in this manual to install the air lines and complete the zone programming steps. The HGM300 setup must also be updated to recognize the new zones.
RDM800 - Logic Diagram 66 Instruction 3015-4148
Table of Recommended Alarm Settings Refrigerant Leak PPM Spill PPM Evacuate PPM R11 100 300 500 R12 100 300 500 R22 100 300 500 R23 100 300 500 R113 100 300 500 R114 100 300 500 R123 15 25 35 R124 100 300 500 R134a 100 300 500 R401a 100 300 500 R402a 100 300 500 R402b 100 300 500 R404a 100 300 500 R407a 100 300 500 R407c 100 300 500 R409a 100 300 500 R410a 100 300 500 R500 100 300 500 R502 100 300 500 R503 100 300 500 R507
RS-485 Communication Protocol Overview The following instructions are intended as a guide for integrating the HGM300 network into a Building Management System. If you are unfamiliar with complex systems of this type, it is recommended that you contact Bacharach for technical assistance. MODBUS RTU Protocol The HGM300 monitor communicates with master devices (such as the RDM800 or a Building Management System) over the RS-485 serial interface.
HGM300 MODBUS RTU Operation Overview The HGM-300 and RDM800 are equipped to communicate with other equipment using the MODBUS RTU protocol. Using this communication channel a MODBUS master device may communicate with up to 15 HGM300s on a communications network, exchanging measurement information, alarm data, fault data, history (logs and trends) and setup information. Additionally, the MODBUS master can control the operating state of an HGM300, placing the HGM300 in any of its different operating modes.
Notes on Network Topologies HGM300s may be connected directly to the MODBUS network or they may be connected to the network through an RDM800. In either case, each HGM300 must have a unique node ID. Up to 15 HGM300s can be connected directly to the MODBUS network. If HGM300s are accessed via an RDM800 connected to a MODBUS network, the RDM800 “BMS enabled” parameter must be set equal to “1” via the “RDM SETUP” screen on the RDM800.
Summary of Registers Register Name Number Type Description System Data 0x0010h R/W HGM System Setup Data Status 0x0011h R/W Operating summary of faults, alarms and status Zone Data 0x12xxh R/W Setup data for up to 16 zones (xx CAL Data 0x0014h R/W Cal Factors for all gases Date/Time 0x0015h R/W Set HGM300 date & time Sensor Data 0x0016h R Raw measurement of sensors Rel.
System Data Register Register 0x0010h R/W 54 bytes Variable Type Length Description Type UI 2 bytes Indicates EEPPROM has been initialized if value = 300 DO NOT MODIFY REV Float 4 bytes Firmware Rev Level DO NOT MODIFY SN UI 2 bytes Firmware Serial Number DO NOT MODIFY Node UC 1 byte Network Slave Node # (valid values are 1-15). The default is that indicated by the Node DIP Switch on main board.
Status Register Register 0x0011h R/W 10 bytes Variable Type Length Description Mode UC 1 byte Defines Operating Mode of HGM-300. 0 = normal Mode; 1 = Zone_Hold Mode; 2 = Diagnostic Mode; 3 = Service mode. DO NOT MODIFY (use zone hold register or service mode register to change this parameter) State UC 1 byte Defines HGM-300 Current State.
Zone Data Register 0x12xxh R/W 78 bytes Each zone for an HGM300 has a separate Zone data structure that is 78 bytes long. The zone number is the low order byte in the register address (i.e., Zone 1 data register = 0x1201h) Variable Type Length Description Location C 13 bytes 13 byte array, Alpha Numeric Description or Name of Zone Flow OK UC 1 byte Status of Flow check. Value of 1 indicates flow check is good. DO NOT MODIFY Refrig.
Notes on Alarms and Alarm Acknowledge The HGM300 can be operated in two different alarm acknowledge modes, Auto and Manual (set via the alarm_ack_mode variable in the system data register). For purposes of this discussion, the term “Alarm” refers to a HGM300 state where the alarm light is on and the appropriate alarm relay is activated. The term “Alarm condition” refers to the external condition (i.e., refrigerant leak) that initially causes the HGM300 to go into an alarm.
Cal Data Register Register 0x0014h R/W 174 bytes Variable Type Length Description Factor Float 132 bytes 33 element array containing cal factors for each of the 33 gases. Order of Cal Factor is defined in Note 1 under Zone Data Curve UC 3 bytes Existing Master Curve to use for user defined “NEW GAS” New Gas Name C 39 bytes 3 x 13 array that contains the names for each of 3 new gases NOTE: “Future” Gases are gases that will be added to the library at a later date.
Sensor Data Register Register 0x0016h R 82 bytes Variable Type Length Description Pressure Float 4 Manifold Pressure is PSIA P_Volts Float 4 Pressure sensor output Voltage Vacuum_P Float 4 Pressure with all value closed and pump on in PSIA Ambient_P Float 4 Absolute Ambient Pressure in PSIA Box_T Float 4 Enclosure Temperature in Degrees C Box_T_Volts Float 4 Box temp sensor output voltage Bench_T Float 4 Optical bench temperature in Degrees C Bench_T_Volts Float 4 Bench
Release Zone Hold Register Variable Rel_Hold Type * Length * Hold Zone Register Variable Zone_Hold Type * Register 0x0017h W Description See description of STATUS REGISTER Register 0x0018h W Length * 10 bytes 10 bytes Description See description of STATUS REGISTER Notes Concerning the HGM-300 Hold Mode The HGM-300 can be made to hold or “dwell” on a particular zone if necessary. The length of the hold time is defined by the HOLD TIME parameter in the System Data Register.
Fault Log Register Register 0x1900, 0x1901h R 302 bytes These registers contain the 20 most recent fault events, the time they occurred, and a pointer to the most recent event. The data is split into 2 registers. The first register contains 200 bytes and the second register contains 102 bytes. The results of these two register reads should be recombined into the Fault Log Data Structure after both have been received Variable Type Length Description Fault UI 40 bytes 20 most recent fault events.
Service Mode Register Variable Rel_Svc_Mode Type * Register 0x001Bh W Length * Description See description of STATUS REGISTER Release Service Mode Register Register 0x001Ch W Variable Ent Svc_Mode Type * Length * 10 bytes 10 bytes Description See description of STATUS REGISTER Notes Concerning the HGM-300 Service Mode The HGM-300 can be placed into service mode if necessary. During service mode the unit will take no measurements, any and all alarms are silenced, and all relays are opened.
PPM Register Register 0x001Eh R 32 bytes Variable Type Length Description PPM UI 32 bytes 16 Unsigned Integers that represent the PPM values for each HGM300 zone NOTE: 16 values are returned independent of the number of actual zones installed in the unit. The master device is required to know how many zones are installed in the unit (available in the System Register) in order to properly interpret the data.
WARRANTY and SERVICE Warranty Subject to the terms herein, Seller warrants the original equipment cataloged or manufactured by the Seller and furnished hereunder is free from defects in material and workmanship, and will be of the kind and quality designated or described on the quotation.
To return equipment to the factory for repair a Return Authorization (RA) number should be requested from the factory. Normal factory repair time is approximately two (2) weeks, unless special provisions have been pre-negotiated prior to the issuance of an RA number. Equipment will not be received without an RA number. Returned equipment should be sent to the factory at the following address: Bacharach, Inc.
HGM300 - Specifications Product Type: Multiple refrigerant gas and multiple area monitoring system for low level continuous monitoring of CFC, HCFC and HFC refrigerant gasses used in most commercial refrigeration systems. System design supports compliance to the refrigerant monitoring requirements of ANS/BSR ASHRE 15-1994.
RDM800 - Specifications Product Description: The RDM800 Remote Display Module provides remote programming, interrogation and display functionality to support the HGM3000 Refrigerant Gas Monitor. The system design supports compliance to the refrigerant monitoring requirements of ANS/BSR ASHRE 15-1994. Inputs: The RDM800 accepts inputs from up to four HGM300 monitors. It offers a wide variety of displays and can fully program any associated monitor. Display: Back lit LCD.
Headquarters: 621 Hunt Valley Circle, New Kensington, PA 15068 Website: www.bacharach-inc.com • E-mail: help@bacharach-inc.com Printed in U.S.A. ® Registered Trademark of Bacharach Inc.
