http://www.omega.com e-mail: info@omega.
SPECIFICATIONS .......................................................................................................................................................... 4 DESCRIPTION ................................................................................................................................................................ 5 THERMOCOUPLE OR RTD SELECTION.................................................................................................................
RESETTING: ................................................................................................................................................................... 16 ELECTRO-MECHANICAL RELAY OPTION ....................................................................................................................... 16 Figure 2. Electro-mechanical Relays Hookup Example........................................................................................... 17 OPEN COLLECTOR OPTION ............
SPECIFICATIONS Typical @ 25 C and rated supply voltage unless otherwise specified. INPUTS: • • • Input types: J,K,T,E,R,S,B t/c, RTD, Voltage, Millivolt, Current & thermistor Cold junction compensation error: +/- 0.5C max (10C to 40C) Open thermocouple indication: ‘OPEN TC’ displayed OPTIONS: • • • • 240Vac @ 50 Hz Power Supply 15Vdc @ 1000ma. Power Supply Open Collector output: 6 open collector transistors @ 50ma. sink each Relay output: 6 SPST 1 Amp. @ 28Vdc, 0.5 Amp.
DESCRIPTION Housed in a wall-mount, water-tight plastic enclosure, the DPS3301 Series is a powerful temperature monitor/indicator. It accepts a single Thermocouple, RTD or Thermistor sensor input and then displays the temperature in either degrees C or F. In addition, it also monitors a number of useful functions such as high and low process readings, process run time, rate of process change etc. Keys are appropriately labeled, so that the user would not have to memorize their functionality.
How to Reset and Program Thermocouple Type (or RTD) A DPS3301-TC that is calibrated for a J, K, T, or E type thermocouple or an RTD model may be programmed for a specific thermocouple, or RTD (385/392) type, by going into SETUP mode (Look under ‘SETUP’). Alternately, a thermocouple/RTD may be selected by turning On power to the unit while holding in the appropriate key (see Figure 1). This procedure also clears the memory and programs factory defalult values for limits, rate timebase etc.
SEE SETUP ON HOW TO SELECT ONE OF THE DISPLAY MODES. RETAINING USER SETTINGS ON POWER DOWN DPS3301 saves all the programmed parameters in an EEPROM (electrically erasable programmable read only memory). An EEPROM stores the programmed parameters even when the power is removed from the unit. However, it is important to note that if the parameters are being changed during setup, they must be saved in the EEPROM by pressing and holding the ‘RESET’ key (till SAVING is displayed) as described under SETUP.
FLOW CHART SETUP PROGRAM LIMITS PROGRAM CONTROLLER PROGRAM LIMIT1 SETPT PROGRAM LIMIT2 DISPLAY TIME Configure Limit3 as Process or Rate DISPLAY OPTION a. Process b. Setpt Devn. c. In. Rate d. Process High e. Process Low f. Elapsed Time g. Timer 1 Count h. Timer 2 Count i.
SETUP MODE Setup is used for configuring various parameters of DPS3301 unit. These parameters include entering limits, timers, dead-bands etc. Entering and Exiting Setup Mode: To get into setup mode, press and hold SETUP key. The display will show ELPSd t and then the value of elapsed time. Keep holding-in ‘SETUP’ key till the display shows ‘SETUP’ and starts scrolling the message 'EntEr PASSCOdE'. To return from SETUP to normal display/run mode, simply push and hold down the ‘RESET’ key.
'PROGRAM CONTROLLER' MODE Display Time On entering Program Controller mode, the very first step lets you program is the display time. This determines the length of time (in seconds) that any VALUE is displayed before message, such as ‘PROCESS’ is flashed. The unit will first show 'dSPLy t' (for Display Time), and then the current setting in seconds. Use ‘^DIGv’ and ‘’ key to set the desired display time. Push ‘SETUP’ key following the selection.
Cold Junction adjustment: After setting Heat/Cool mode, the next parameter is the cold junction reference temperature adjustment. The display will first show 'COLd JN' , and then the cold junction temperature will be indicated. Use ‘^DIGv’ key to adjust until the display reads the proper temperature. Once the correct temperature is displayed, push ‘SETUP’ key to enter that setting and go to temperature Calibration mode. NOTE 1: The unit comes pre-calibrated from the factory.
NOTE 1: The unit must be powered up for at least ten minutes before any adjustments are made. NOTE 2: For calibrating units with RTD or Thermistor inputs, connect the source to input connector, dial in a temperature near high end of the scale and adjust gain potentiometer on the back of the unit (See figure 7 for reference). Thermocouple type Selection: Next function is the last one in system setup. Here you select the type of thermocouple for which the unit has been calibrated.
Programming Limit 3: As Process Limit: If Limit 3, in the above step, was configured as a Process limit, then the message displayed on entering this mode will be ‘PrG Lt3’. This will be followed by displaying the current value of Limit 3 . Use ‘’ key to move flashing to the next digit and ‘^DIGv’ key to increment/decrement the value of flashing digit. As Rate Limit: If Limit 3, in the above step, was configured as a Rate limit, then the message displayed on entering this mode will be ‘RATE Lt’.
energized. In Mode 1 the timer is ON for a programmed amount of time after a temperature limit is reached (limit1 for Timer 1 and Limit 2 for Timer 2). When programmed amount of time has elapsed, the timer is deenergized. Mode 2 is used to produce a programmable time delay after the temperature limit is reached. After the delay, the timer output comes ON and stays ON until reset by the operator. For more details, refer to the TIMER MODES section.
Audio Alarm On/Off: This unit supports an audio alarm option 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 ‘^DIGv’ 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.
setpoing will be indicated. Deviation Alarm: Limit 4 has the capability to work either as process or as deviation alarm. This configuration is done during setup (look under SETUP). Also entered during setup is the alarm value. Programmed value is absolute and it works on negative as well as positive deviation e.g. if deviation alarm is set to 10, then output will get activated if process deviates –10 or +10 from the Setpoint.
limit alarms. (Check model number printed on the unit for option). If ordered with relays, then these relays are programmed during Setup to operate as Normally Open (NO) or Normally Closed (NC). The default setting is Normally Open. Each of these limit relays provides a switched output whenever a limit is reached. The maximum rating for a 120Vac unit is 120Vac @ 0.5 amp or 28 Vdc @ 1.0 amp. Figure 2. Electro-mechanical Relays Hookup Example PLUG-IN CONNECTOR 8 Limit # # 4 Limit 7 120 VAC @ 0.
To display Timer #1 value, push the TIME key twice. The first push shows elapsed time, while the second push will first display 'tr1 Cnt' (for Timer1 Count) and then Timer 1 value. To display Timer #2 value, push TIMER key three times. First two pushes display elapsed time and timer 1 value respectively, while the third push brings up timer 2 value on the display. This is , however, preceded by the message 'tr2 Cnt' (for Timer 2 Count).
HIGH AND LOW PEAKS A useful feature provided by the DPS3301 system is its ability to track high and low temperature peaks. This function is useful if a process must be left unattended for a long period of time, and it is necessary to find temperature extremes during the unattended period. High and low process peaks are displayed by pushing ‘HI/LO’ key. Pushing this key once will display the message 'HIGH Pt' (for High Point) and then the value of the highest temperature monitored by the unit.
‘SIGNAL CONNECTOR’ in figure 4. Also indicated are the input signal’s positive and negative polarities for thermocouple connection. These markings are also on the printed circuit board in front of the connector. Care should be taken to connect the positive and negative legs of the signal source to the proper terminals on the connector. A wrong connection will result in incorrect process readings. (No polarity is necessary for RTD or thermistor).
FIG 4.
DIRECT INTERFACE TO UNIVERSAL RELAY MODULE For high amperage loads, DPS3300 series units can be used in conjunction with Universal Relay Module (Model RELAY-URM400/800) which provide up to eight 15 ampere relays. Both open collector and relay models can be interfaced directly to RELAY-URM400/800 units. RELAY-URM400/800 series relay module is a very versatile instrument that is used for switching up to eight 15 ampere loads.
MOUNTING PICTURE HANGING-TYPE FIXTURE FOR MOUNTING SCREW 120mm 4.72” MOUNTING SCREW SLOTS (Mount Screws from front—see picture below ) 151mm 5.
Page 24
Page 25
M4300/0907 Page 26
