PROGRAMMABLE PROCESS MONITORS USER’S MANUAL DP3600, DP3700 AND DP3800 SERIES OMEGA ENGINEERING, INC., ONE OMEGA DRIVE, STAMFORD, CT 06907.
SPECIFICATIONS ...............................................................................................................................................................................................3 DESCRIPTION......................................................................................................................................................................................................4 SET UP ......................................................................................
SCALING ..............................................................................................................................................................................................................12 OFFSET .................................................................................................................................................................................................................12 TARE .......................................................................
SPECIFICATIONS (typical @ 25 C and rated supply voltage unless otherwise specified). STANDARD INPUT: * 4 - 20 MA, 10 - 50 MA, 0 - 5 VDC, 0 - 10 VDC EXTERNAL HOLD: * An external low level signal applied to the HOLD pin on the rear connector will initiate hold function. ANALOG TO DIGITAL CONVERSION: * 41/2 Digit A/D conversion. * Dual slope integrating converter. * Conversion Rate: seven conversions per second typical.
DESCRIPTION The DP3600 series of instruments are micro-processor based intelligent monitors that are capable of performing several tasks in addition to displaying the process variable. The micro-processor technology used in the system design has provided these instruments a cost and performance edge that is simply not possible with analog systems. Various process parameters monitored by the system can be displayed by pushing appropriate keys on the front panel e.g. LMT1, Peak etc.
Programming Group Selection: On entering correct passcode, setup procedure starts. The very first step will let you select one of the three groups of parameters that you can program. Three available groups are: 1) SCALING 2) PROGRAM LIMITS 3) PROGRAM SYSTEM. Each group will let you program various parameters as shown below: SCALING PROGRAM LIMITS PROGRAM SYSTEM 1. High Scale 2. Low Scale 3. Offset 4. Tare 1. Process Limit1 2. Process Limit2 3. Setup limt 3 for Rate/Process 4. Process Limit 3 5.
Offset: Next configurable function is offset and is indicated by the message ‘OFFSET’ followed by current offset value. To change the value of flashing digit press ^v key. To move the flashing digit, push key. After programming the desired value of offset, push the "SETUP" key to get to the next function. Tare: Tare mode is indicated by the word 'TARE' followed by current Tare value. To change the value of flashing digit, press ^v key. To move the flashing digit, push key.
Selection of Limit 4 as Process or Deviation Limit: This step comes after programming Limit 3 and is indicated by the message ‘LT3 Pr’ (if Limit 3 is setup as Process limit) or ‘LT3 dEN’ (if Limit 3 is setup as deviation limit). Alternate selection can be made by pushing ^v key. Push SETUP key after making the selection. Programming Limit 4: As Process Limit: If Limit 4, in the above step, was configured as a Process limit, then the message displayed on entering this mode will be ‘PrG Lt4’.
Audio Alarm On/Off: This unit supports an audio alarm which comes on when ever a limit value is exceeded. This alarm can be turned On or Off, as desired. The selection is made by pushing ^v key. If the alarm is ON, the display will read ‘ALR ON’ (Alarm On). Alternately, it will display ‘ALR OFF’ (for ‘Alarm Off’). Push SETUP key after desired setting is displayed. This last push on SETUP key will also take you back to the very beginning of setup mode.
Rate Time-Base: This step is for programming time-base for calculation of Rate. Units of time-base are seconds. Again, the active digit will be flashing. To change the value, push ^v key. To activate another digit for change, use key. On finishing, push SETUP key. Remote Tare/Hold: Remote Tare/Hold feature lets you select between the remote switch being used for resetting tare or holding the reading on the display.
SET UP FLOW CHART: SETUP SCALING PROGRAM LIMITS PROGRAM SYSTEM (SCALING) (PROG Lt) (PrG SYS) HIGH SCALE PROGRAM PROCESS LIMIT 1 DISPLAY OPTION (HI SCLE) (PrG Lt1 -- 01.234) LOW SCALE PROGRAM PROCESS LIMIT 2 (LO SCLE) (PrG Lt2 -- 01.234) OFFSET LIMIT 3 RATE OR PROCESS (OFFSET) (Lt3 rtE) or (Lt3 Pr) TARE PROGRAM LIMIT 3 VALUE (TARE) (PrG Lt3 -- 02.123) 1. 2. 3. 4. 5. 6. 7. 8.
MAX. AND MIN. READINGS (PEAKS) Displaying: To display the peak values of Process variable push Peak key once and let go. The display will first indicate ‘HIGH Pt’ briefly and then the value of the highest Process variable value monitored by the system. A second push while high peak is being displayed will bring up low peak value on the display. The value will be preceeded by the message ‘LO PT’..
PROCESS CHANGE Displaying: The system will constantly monitor the total amount of change in process variable since start or last reset. This change is displayable in engineering units by pushing the ‘PR CNG’ key. This function is useful in tracking the change that has taken place in the process e.g. in a tank containing 300 gallons of water, an addition of 200 gallons will show that the total amount of water is 500 gallons.
TARE Tare function is used for taking out a preset amount of process variable from the total reading e.g. if we are measuring weight of a certain product being put in a container but do not want the weight of the container to show on the display, then enter the weight of the container as tare value. The DP3600 unit will then automatically subtract the weight of the container from the total reading and display the weight of the product only. Desired Tare is entered during SETUP procedure.
Timer Limits: Displaying: To display timer limits, first push the TIME key. While still in this mode go on to push LIMITS key. The display will briefly show TR1 LT (for timer 1 Limit) and then the previously programmed value. Pushing the LIMITS key one more time will display TR2 LT followed by pre-programmed timer 2 value. Programming of timer limit values is done during setup procedure (for details look under SETUP). Timer values are can also be displayed without pushing ‘TIME’ key.
Open Collector Option Whenever a limit is reached an open collector output provides a 5 Vdc signal at 50ma. on the output connector, e.g... Limit 1 provides its 5 volt output signal between pins 1 and 2. Figure 2. Open Collector Hookup Example Instrument +OUTPUT 1 -OUTPUT 2 LOAD Solid State Relay, LED, Buzzer etc. HOLD FUNCTION The hold function allows to freeze the Process Variable reading in the display window indefinitely till the Hold pin is active.
FIGURE 3.
TROUBLE SHOOTING If the meter locks on a particular display, unplug and plug in again the meter to unlock the display. A total reset defaults all scaling values to zero. To perform this reset, re-apply power with RESET key pressed in. Factory preset values for Current, Voltage and millivolt, respectively, can be programmed by simply reapply power with either ^v, RATE or TARE key pressed in.
3.62" (91.9mm) MOUNTING 1.70" 43.2mm 1. Cut a hole in panel to the specifications shown in the figure 4: NOT DRAWN TO SCALE 1 Figure 4. Panel Cutout Dimensions A 3 2 4 B 2. Insert pannel meter into the hole until it is flush with the pannel. 3. Refer to Figure 5. Losen the wing nuts (3) on the two screws (2) on the bracket. You don't have to remove the screws. 4. Slide the open end (A) of the bracket onto the meter until it is flush with the panel.
