DTM 995B Lascar

DTM 995B LCD Thermocouple ORDERING INFORMATION Indicator Standard Instrument DTM 995B (panel meter, fixing kit, data sheet) FEATURES Measures temperature from a K, J or T-type thermocouple -200 to +1300C (-328 to +1999F) measurement range Cold-junction compensation Displays current, highest and lowest readings 19mm (0.75) digit height Screw terminal connections LED backlighting The DTM 995B is compatible with K, J and T type thermocouples. It can measure between -200 and +1300C (-328 to +1999F) when using an appropriate thermocouple. The current value and the maximum and minimum values since power-on are recorded, which can be recalled and displayed by using an external push button connected to the meter. Calibration can be performed easily using two potentiometers located on the rear of the meter. Cold-junction compensation is used to maintain accuracy when the meter is exposed to changes in temperature. The meter is housed in a robust carrier, which can be bolted in place or panel mounted using the low profile bezel, window and clips provided. Backlighting is fitted for use in poor lighting conditions. SPECIFICATIONS Minimum Typical Maximum Unit 1 (2) Accuracy (excluding probe) C (F) Thermocouple measurement range (K-type) -200 (-328) +1300 (+1999) C (F) Thermocouple measurement range (J-type) -130 (-202) +900 (+1652) C (F) Thermocouple measurement range (T-type) -200 (-328) +350 (+662) C (F) Supply voltage (normal operation)* 7.5 V d.c. 30 4.75 5 Supply voltage (5V mode)* 5.25 V d.c. 5 Backlight voltage** 4.75 5.25 V d.c. Supply current 6mA ( 30V) 13mA ( 5V) mA Supply current with backlighting** 20mA ( 30V) 50mA ( 5V) mA Operating temperature range 0 (32) 50 (122) C (F) Temperature stability C/C (F/F) 0.05 (0.1) * A 5V mode is available by moving DIP switch 2 to the on position. Inputting a voltage larger than 5V in this mode may cause permanent damage to the meter. ** Backlighting can be run off the internal voltage regulator by moving DIP switch 1 to the on position. Using the backlighting in this way will cause some self heating of the meter. This can be calibrated out during initial setup, however the final application will need to continue using the backlighting to maintain the calibration. www.lascarelectronics.com Specifications liable to change without prior warning Issue 2 06/2010 S.L Applies to DTM 995B Page 1 of 3DTM 995B LCD Thermocouple Indicator CALIBRATION PROCEEDURE It is recommended that the DTM 995B is calibrated with a matched probe to achieve the most accurate readings. Calibration uses two known temperatures to adjust the span and offset of the meter the example below uses our recommended 0C and 100C (32 and 212F) as these temperatures can be achieved using water at the point of freezing and boiling respectively. 1) Place the thermocouple at the first known temperature (e.g. 0C (32F)). Adjust the OFFSET potentiometer to display the correct value (e.g. 000 for C (or 032 for F)). 2) Place the thermocouple at the second known temperature (e.g. 100C (212F)) and adjust the CAL potentiometer to display the correct value (e.g. 100 for C (or 212 for F)). 3) Repeat steps 1 and 2 until there are no more adjustments of CAL and OFFSET required to display the correct reading at each known temperature. SCREW TERMINAL FUNCTIONS 1. LP- Negative power supply to the LED backlighting 2. LP+ Positive power supply to the LED backlighting 3. T- Connection to negative part of thermocouple 4. T+ Connection to positive part of thermocouple 5. V- Negative power supply connection to the meter Check position of DIP switch 2 before connection power supply 6. V+ Positive power supply connection to the meter 7. SW- Negative switch connection Used to cycle between current, maximum and minimum readings since power-on 8. SW+ Positive switch connection Note - When connecting thermocouples, ensure that the wires are carefully cleaned and are connected directly to the module. Only use extension cables and connectors specifically designed for thermocouples. DIMENSIONS All dimensions in mm (inches) Panel cut-out 72 x 40 (2.83 x 1.57) Panel cut-out 72 x 40 (2.83 x 1.57) Maximum panel thickness 3mm (0.12). Maximum panel thickness 3mm (0.12). 76.0 (2.99) 76.0 (2.99) a a 72.5 (2.85) 72.5 (2.85) a. 1.0 (0.04) a. 1.0 (0.04) b. 2.0 (0.08) b. 2.0 (0.08) c. 6.5 c.(0.26)6.5 (0.26) d. 11.5 d.(0.45)11.5 (0.45) e. 11.0 e.(0.43)11.0* (0.43)* *typical depth of tallest component behind PCB*typical depth of tallest component behind PCB, , this dim ethnissi odnim ise fnosri ognu iidsa fnocr eg uoindlay.nce only. 51.0 (2.01) 51.0 (2.01) b c b c 61.5 (2.42)61.5 (2.42) d e d e 51.0 (2.01)51.0 (2.01) 5.7 5.7 (0.22) (0.22) CAL OFFSET CAL OFFSET 1 18 8 REAR REAR VIEW VIEW 3.0 3.0 71.5 (2.81) (0.12) (0.12) 71.5 (2.81) www.lascarelectronics.com Specifications liable to change without prior warning Issue 2 06/2010 S.L Applies to DTM 995B Page 2 of 3 39.0 (1.54) 44.0 (1.73) 24.0 (0.94) 40.5 (1.59) 39.0 (1.54) 44.0 (1.73) 24.0 (0.94) 40.5 (1.59) 24.0 (0.94) 24.5 (0.96) 24.0 (0.94) 24.5 (0.96) LP- LP+ T- LTP+- LP+ V- T- V+ T+ SW- V- SW+ V+ SW- SW+