Section A Chambers 1.0 Model 518 CONTROLLED ENVIRONMENT CHAMBER Many applications require a controlled environment for testing, fabricating and/or storage. The Model 518 Microprocessor Controlled Environmental Chamber is a completely integrated system, fabricated from 0.375” clear and white acrylic that provides the user with undistorted visibility of the inside of the controlled environment section.
The systems are totally accessible by removal of the acrylic panel on the right side of the Chamber. Controllers and operating systems that are available with the Model 518 are as follows: 1. Microprocessor Temperature Controller - includes Model 554 RTD Temperature Sensor (Std.) 2. Integrated 500 Watt Heater (Std.) 3. Model 563 Liquid CO2 Cooling System (Std.) 4. Microprocessor Humidity Controller - includes Model 554 Temperature Compensated RH Sensor (Std.) 5.
1.1.1 Front Panel Description The front panel of the Model 518 Chamber is shown in Figure 1.0-3. Figure 1.0-3 Model 518 Chamber Front Panel 1.1.1.1 Microprocessor Controllers The Temperature Microprocessor Controller is the unit on the left. The Humidity Microprocessor Controller is the unit on the right. Refer to Sections 5.0 and 3.0 respectively for a full explanation of all functions and features.
1.1.1.2 Front Panel Switches 1. ‘POWER’ - The Main Power Switch is the black rocker switch located directly below the Temperature Controller, to the left of the Fan Power Knob. This switch disconnects all power going to the Chamber and external operating systems. “I” is “ON”, “O” is “OFF” 2. ‘FAN’ - The Fan Power Knob is located to the right of the Power Switch. In the ETS Model 518 Environmental Control Chamber, this switch turns the circulation fans inside the cabinet workspace on and off. 3.
controllers used for interfacing the Model 554 Sensor with the microprocessor sensor inputs. 1. Switches - The switches are permanently mounted to the ‘front’ PC Board, referred to as the ‘Switch PC Board’. 2. Relays - The relays are removable and mounted in sockets (and secured with plastic cable ties) on the ‘rear’ PC Board, referred to as the ‘Relay PC Board’. 3. Sensor Input - The Sensor Input is the 5-pin DIN jack located in the lower left corner of the ‘Switch PC Board’.
Calibration Procedure: 1. Attach the 0-1 VDC signal source to the Senor Input Jack on the ‘Switch PC Board’, pins 1&4. Pin 1 = Humidity, Pin 4 = Temperature, Pin 2 = Ground. 2. Set the signal source to 0.000 VDC (ground). 3. Using the Meter, measure at the sensor inputs on each of the microprocessor controllers, positions 1 (+) and 2(-). 4. Measuring at the RH Microprocessor, adjust R3 for a reading of 0.000mVDC. 5. Measuring at the Temperature Microprocessor, adjust R1 for a reading of 0.000mVDC. 6.
Figure 1.0-2 Model 518 Side Interface Panel 1.1.2.1 AC Power Cord Input (Mains) Labeled POWER, this Universal IEC power connector is located on the bottom, center of the panel. The Voltage supplied (Mains) must match the Chamber voltage. All Chambers are 115 VAC / 60 Hz, unless otherwise specified. 1.1.2.2 COMM PORT (RS 485 & Analog Voltage Outputs) The Comm Port is the 9-pin subminiature-D jack (sub-D) located to the left of the AC Power Input.
The RS 485 portion of the Comm Port will only be active if the Controller is fitted with the COMMS option (see section 1.2.1 LEVL C). The COMMS option allows the microprocessor to communicate with a PC running the CALCOMMS software. RS 485 Wiring Connections Tx/Rx+ = Pin 7 Tx/Rx- = Pin 2 Ground = Pin 4 If runnng the CALCOMM computer program, see “CALCOMM” section of this manual for set-up instructions. 2. the Analog Voltage Output The Analog Voltage Output is always active.
1.1.2.4 COOL INPUT When using the standard Model 563 Liquid CO2 Cooling System, a brass quick disconnect fitting is located in the top, right corner of the acrylic Side Panel. This fitting protrudes through the acrylic panel for connection to the liquid CO2 gas tank (user supplied). (See Section 4.2.1 Model 563 Cooling System) 1.2 Controlled Environment Description The controlled environment section of the Model 518 Chamber is 13 ft3. (0.32 m3) and measures 39”Wx22.5”Dx22”H (99x57x56 cm).
Section B: Humidity 2.0 HUMIDITY OPERATING SYSTEMS 2.1 Humidification System The Model 518 Chamber includes an ETS Model 562 Ultrasonic Humidification System. The humidifier is a separate unit that sits adjacent to the right side of the Chamber. The humidifier is connected to the chamber by attaching the 1” I.D. clear tubing provided, to the input barb located on the upper right corner of the Side Access Panel (left of the cooling valve input).
remove the top immediately, check for problems and try again. If the problem persists, contact ETS. 3. Turn on the humidifier POWER switch. If used with an ETS Automatic Humidity Controller, see “Humidifying” in the Controller manual. The power indicator light will turn on immediately and the internal blower will begin to operate. When the basin is full, the automatic water level switch will activate and provide power to the ultrasonic transducer.
When the microprocessor tells the humidifier to activate, the small green LED in the upper, left corner of the microprocessor display will light. The humidifier will begin producing a mist and forcing it into the chamber through the humidity input barb. 4. The microprocessor will determine the amount of humidification needed to maintain the desired set-point. If less than the full capacity of the humidifier is needed, the controller will provide pulses of power to the unit to limit the output.
2. Empty all the water from the unit. Siphon water out or soak it up with a sponge. 3. Disconnect (or remove) the water tank. 4. Clean the surface of the transducer using distilled vinegar and a soft, clean cloth. This is very important. If the transducer is not kept clean, it will fail. Using distilled or deionized water keeps the build-up to a minimum, but cleaning with distilled vinegar cannot be ignored. NOTE Do not use any tools with metal parts or sharp edges to clean the transducer.
2.2.1 Desiccant/Pump Dehumidification System The Model 561 Dehumidification System is a closed loop system, designed to reduce the relative humidity in the Model 518 Chamber to less than 10% RH. When paired with the Model 518 Microprocessor Humidity Controller, the humidity inside the chamber can be controlled to within +/- 0.2% RH of the set-point at the sensor. 2.2.1.1 Description The Model 561 Dehumidification System includes a small air pump (located inside the Chamber control cavity), 1.0 lb.
6. Contents: 1 lb. of #8 mesh CASO4 Indicating Desiccant. 7. All connections are made using 5/16” ID tubing. ¼” ID x 5/16” OD hose barb adapters are included to adapt from the ¼” OD fittings on the ‘Side Interface Panel’ to the desiccant column. 8. Plastic cap is fitted with “O-Ring” gasket. 9. Desiccator coil spring is made of cadmium plated steel. The system delivers air dried to a dew point of -100°F.
8 Turn on the “RH” STANDBY switch on the front panel. This will not automatically turn on the dehumidification system. Turning on the “RH” STANDBY switch only makes the dehumidification system available to the microprocessor controller. When the controller tells Dehumidification System to activate, the small red LED on the lower right side of the microprocessor display will light. The internal air pump will begin moving.
operate continuously to assure a constant supply of dried air on demand. The 3-way control valve controls the flow of dried air into the chamber workspace. The air pump, dryer and valve are mounted inside the control section of the Chamber. The air intake to the pump is muffled and is very quiet. The pump draws in ambient air and compresses it to 50 psi. The compressed air is passed on to the dual column dryer where it is forced through one of the desiccant columns.
2.2.2.3 Self-Regenerating Dehumidification System Set-Up The standard self-regenerating dehumidification system is contained entirely within the chamber control section. If house air is used, a quick disconnect air fitting will be installed on the Chamber Side Interface Panel. 2.2.2.4 Operation To operate the self-regenerating system proceed as follows: 1. Open the chamber vent by removing the supplied 1” green Caplug. 2.
5. The microprocessor will determine the amount of drying needed to maintain the desired set-point. If less than the full drying capacity of the Self-Regenerating Dehumidification System is needed, the controller will provide pulses of power to the control valve to limit the quantity of dried air coming into the chamber. The controller will open and close the control valve cyclically to obtain an average input of dried air less than the full capacity of the system.
3.2 Microprocessor Humidity Controller Operation 3.2.1 Set-Point Adjust 1. Press and hold the “∗” button. The letters “rh” will appear, followed by the current set-point value. While holding the “∗” button, the current set point value and ‘rh’ will alternately appear in the microprocessor display. 2. To adjust the set point higher, press the “t” button. To adjust the set point lower, press the “u” button. 3. Release the “∗” button. 3.2.
The minimum cycle time for the ETS Model 562 is 1.0 second. 3.2.3 Dehumidification System The Dehumidification System air pump is located inside the Chamber control cavity. The desiccant column is attached externally through the fittings labeled ‘AIR IN’ and ‘AIR OUT’ on the ‘Side Interface Panel’. To operate the Model 518 Dehumidification System: 1. Read the operating instructions for the Dehumidification System being used. 2. Adjust the set-point to a value below the ambient RH conditions. 3.
3.3 Programming the Microprocessor Controller 3.3.1 Accessing the Programming Menu 1. To access the Controller Program Menu, press the “t” and “u” buttons simultaneously for three (3) seconds. The controller will enter the Menu on Level 1 in the “tunE” function. (If using the CalComm Computer Program, see the “CALCOMM” section of the Manual). 2. To scroll to different parameters within a Level, press the “t” button to scroll right and the “u” button to scroll left. 3.
3.3.3 LEVL 1 (Level 1) Level 1 is the programming level. The Proportional, Integral, and Derivative controls are adjusted here. The combination of PID values is virtually limitless. This allows the controller to be used in a wide variety of applications. However, this flexibility can also lead to confusion when programming the controller in the Model 518’s limited mode of operation. To avoid confusion, this section will discuss which parameters may be adjusted, which parameters should not be adjusted.
der.t – (2.0) Derivative Time in seconds. The derivative time, in combination with the dAC, is responsible for keeping the environment moving toward the set-point, following a pre-determined curve (set by the dAC in combination with the bAnd). The curve is followed to help avoid set-point overshoots. Shortening the derivative time will cause the controller to recover slowly from disturbances. Lengthening the derivative time may cause oscillations. dAC – (1.0) Recommended.
SET.2 – (0.0) Setpoint 2 allows the user to create a setpoint offset for the Dehumidification System. It is generally not used for the Desiccant Dehumidification System. bnd.2 – (10.0) Recommended. Band 2 should generally be equal to bAnd. The heating and cooling system will work within the same proportional band, helping to prevent overlap in the system’s operation. (i.e., the dehumidification system will have a tendency to stay ‘off’ when only humidification is needed and vice versa). CyC.2 – (2.
Limits maximum SP1 (humidifier) output power during warm-up and in proportional band. PL.2 – (100) Set SP2 power limit percentage, 100 to 0% of the duty cycle. Limits maximum SP2 (dehumidifier) output power during warm-up and in proportional band. SP2 OPERATING MODES SP2.A – (Cool) Main SP2 operating mode. Must remain in “Cool” mode to properly operate the dehumidification system. SP2.b – (nonE) Subsidary SP2 mode: latch/sequence. Non-linear dehumidify proportional band.
OUTPUT CONFIGURATION SP1.d – (SSd1) Do not change. appropriate output. SP2.d – (SSd2) Do not change. appropriate output. Assigns humidification control to the Assigns dehumidification control to the SAFETY SETTINGS Burn – (uP.SC) Do Not Change. Sensor burnout/break protection. This safety setting is not applicable for RH control, it is meant as a high temperature / low temperature cutoff for heating applications to protect the surroundings from damage due to sensor failure. rEv.d – (1r.2d) Do Not Change.
VEr – software version rSEt – (none) Do Not Change. If the unit is reset, all programmed information will be lost. Each parameter must be re-entered manually. 3.3.6 LEVL 4 (Level 4) Level 4 is a “hidden” level. This allows “locked” functions to be inaccessible to any unauthorized user. Access to Level 4 is gained through “VEr” in Level 3. Press and hold “t” and “u” for ten seconds. Enter Level 4 at “LoCK”, release “t” and “u” together. LoCK – (LEV.2) Select from three lock options. LEV.
Because the controllers are “stand alone” they do not need PC supervision for their normal function, and will continue to control the process unaffected by failure of any part of the communications loop. When used with the Model 518 Chamber, the Temperature Microprocessor & Humidity Microprocessor COMM PORTS are wired together, in parallel. One RS-485 COMM PORT, common to both controllers, is located on the ‘Side Interface Panel’ of the Model 518 Chamber. 3.4.1 Set-up and Installation (Refer to pp.
Software installation instructions can be found on pp. 9-11 of the CALCOMMS Manual. The CALCOMMS Manual is separate from the CAL 3300 Users Manual, it is the manual with the color cover. 3.4.2 Operation After installing the computer program and making the appropriate wiring connections to a PC, turn to p. 11 in the CALCOMMS Manual. This section is titled GETTING STARTED. Follow the directions to begin operating the program. 3.4.2.1 MODBUS Addresses The MODBUS address is found in Level C. (See Section 2.4.
Section C Temperature 4.0 HEATING OPERATING SYSTEMS 4.1 Heating System The Model 518 Chamber contains two (2) 250 Watt Electric Heaters (500 Watts total). The heater is an integral part of the chamber, located inside the Chamber workspace. Since the heater is already installed, there is no additional set-up required. After turning “ON” the “TEMP” STANDBY switch, the microprocessor temperature controller governs the operation of the Heating System. 1.
The ETS Model 563 Gas Cooling System enables the temperature within the Model 518 Chamber to be reduced below ambient. 1. The System utilizes Liquid CO2* (Carbon Dioxide) as the cooling medium. CO2 is user supplied. 50lb. CO2 tanks are readily available from local bottled gas companies. Liquid CO2 with a DIP Tube must be specified. The DIP Tube allows liquid to be siphoned from the bottom of the tank. CO2 Gas (without DIP Tube) will not provide cooling with this system. 2.
4. Although CO2 is non-toxic, it can cause asphyxiation if not used in areas with adequate ventilation. The Model 518 Chamber is equipped with a Chamber Vent (1” White Hose Barb located in the middle of the Black Panel on the right side of the Chamber). The spent CO2 gas will escape from the Chamber Vent and dissipate into the room atmosphere. To vent the gas outside of the room or building, connect an appropriate length of 1” ID tubing to the Vent Hose Barb.
The CO2 will bleed out of the cooling nozzle, into the chamber. When all the CO2 is out of the system, the flow of gas from the nozzle will stop. 3. Using a wrench, disconnect the Transfer Hose (loosen the large brass fitting) from the CO2 tank. 4. Replace the empty tank with a fresh Liquid CO2 tank. Then, using a wrench, reconnect the transfer hose. 5. Turn “OFF” the “COOL” switch on the front panel. This will close the Cool Valve. 6.
2. To lower the CO2 consumption rate and extend the operating time per tank, insulation should be added to the chamber. Adding insulation will reduce heat loss and aid in stabilizing the chamber temperature (especially at very low temperatures). 4.2.1.6 Maintenance and Troubleshooting The Model 563 Liquid CO2 Cooling System should provide years of trouble free service. Other than changing CO2 tanks when depleted, very little servicing is required.
5.0 MICROPROCESSOR TEMPERATURE CONTROLLER 5.1 System Description The microprocessor temperature controller, with Model 554 RTD Temperature Sensor is capable of controlling the temperature in the Model 518 Chamber by supplying a proportionally controlled power output to the Heating System and/or Cooling System. The controller provides low voltage (6 VDC) control signals to the HEAT and COOL solid state relays, located on the ‘RELAY’ PC board.
This will not automatically apply power to the heaters. Turning on the “TEMP” STANDBY switch only makes the heaters available to the microprocessor controller. When the microprocessor activates the heaters, the small green LED in the upper left corner of the Temperature display will illuminate. The red neon light on the ‘Fan Panel’ will also illuminate to indicate that the heaters are receiving power. 3.
If less than the full output capacity of the cooling system is needed, the controller will provide pulses of power to the unit to limit the output. The cooling system will be turned on and off cyclically to obtain an average output lower than the full capacity of the cooling system, appropriate to maintain the desired set-point in the enclosure. For best results, the Cycle Time 2 (CyC.2) for the Model 563 Gas Cooling System should be set as short as possible. The ETS Model 563 minimum cycle time is 1.
Addr – (1) Instrument Communication Address. This address may be changed to any number suitable to the user. bAud – (9600) The baud rate should be set as high as possible. dAtA – (18n1) Do Not Change. The data format should not change. DbuG – (off) Do Not Change. Debugging is an advanced feature that will not be covered in this manual. 5.3.3 LEVL 1 (Level 1) Level 1 is the programming level. The Proportional, Integral, and Derivative controls are adjusted here.
bAnd – (1.0) Proportional Band for the heaters. int.t – (4.1) Integral Time in minutes. The integral time is responsible for calculating how much output should be coming from the heating and cooling Systems to maintain the desired conditions. der.t – (14.0) Derivative Time in seconds. The derivative time, in combination with the dAC, is responsible for keeping the environment moving toward the set-point, following a pre-determined curve (set by the dAC in combination with the bAnd).
SP2 OPERATING PARAMETERS The SP2 parameters can be configured in a variety of ways. In the Model 518 temperature controller, the SP2 parameters are used to tailor the cooling system output for best temperature control. The SP2 parameters are all shown in °C. SET.2 – (0.0) Setpoint 2 allows the user to create a setpoint offset for the cooling system. It is generally not used for the Gas Cooling System.
MANUAL CONTROL MODES SP1.P – Read SP1 output percentage power. (Read only). hAnd – (off) SP1 Manual percentage power control. For manual control, should a sensor fail, record typical SP1.P values beforehand. PL.1 – (100) Set SP1 power limit percentage, 100 to 0% of the duty cycle. Limits maximum SP1 (heater) output power during warm-up and in proportional band. PL.2 – (100) Set SP2 power limit percentage, 100 to 0% of the duty cycle.
inPt – (Lin1) Selects a Linear Input Voltage setting (0-50mV) for use with the ETS Model 554 RTD Temperature Sensor & Sensor Interface PC Board (01VDC Input, 0-50mVDC Output). unit – (°°C), (°°F) Selects process units. The process units can be changed independent of the calibration settings. In other words, changing the setting from °C to °F or any other units will not affect the calibration settings, it will only change the units displayed. 5.3.5 LEVL 3 (Level 3) Level 3 is the output configuration level.
NOTE The Model 518 ‘Sensor Interface Board’ includes an internal ZERO adjustment pot that is far more accurate than the microprocessor setting. PERFORMANCE DATA ChEK – (oFF) Select control accuracy monitor. rEAD – (Var) Read control accuracy monitor. TECH – (Ct A) Read Autotune cycle data. Using the Autotune function is not recommended with the temperature controller VEr – software version rSEt – (none) Do Not Change. If the unit is reset, all programmed information will be lost.
5.4 CALCOMMS - Computer Interface CALCOMMS is a graphic Windows™ based software package designed for PC supervision of CAL 3300 Controllers. It offers the capability of remote adjustment, instrument configuration, cloning, saving and retrieving instrument settings to files together with logging and charting in real time. Communications uses the MODBUS® protocol via a fully isolated RS485 link.
5.4.1.2 Connections 1. Connect the supplied 9-pin male/female subminiature-D cable to the RS-485 COMM PORT on the ‘Side Interface Panel’. 2. Connect the other end of the cable to the ‘RS485’ side of the RS232/485 converter. 3. Connect the ‘RS232’ side of the converter into the appropriate Comm Port on the PC. 5.4.1.4 Software Installation Software installation instructions can be found on pp. 9-11 of the CALCOMMS Manual. The CALCOMMS Manual is separate from the CAL 3300 Users Manual.
6.0 WARRANTY Electro-Tech Systems, Inc. warrants its equipment, accessories and parts of its manufacture to be and remain free from defects in material and workmanship for a period of one (1) year from date of invoice and will, at the discretion of Seller, either replace or repair without charge, F.O.B. Glenside, similar equipment or a similar part to replace any equipment or part of its manufacture which, within the above stated time, is proved to have been defective at the time it was sold.
CONTROLLED ENVIRONMENT CHAMBER Model 518C Operating Manual 11/14/02 48
