DPM942

DPM 942 4-20mA Loop Powered Indicator A loop powered indicator giving an accurate, zero corrected indication of 4-20mA loop current. Calibration is by two 20-turn cermet potentiometers which allow sensitive adjustment of the instrument. The meter is housed in a robust carrier, which can be bolted in place or panel mounted using the low profile bezel and clips provided. 19mm (0.75) Digit Height Programmable Decimal Points Low Volt Drop Simple Screw Terminal Connections CUSTOM SCALING For alternative scaling to the standard 0 - 1000, cut Link 8 and short Link 7. Add two resistors R12 and R13 which Stock Number will set the basic scale of the meter. The highest practical Standard Meter DPM 942 value for the R12 and R13 series combination is 12R. To select your desired scaling, use the following formula: Specification Min. Typ. Max. Unit R12 + R13 = Full Scale reading at 20mA Accuracy (overall error) * 0.05 0.1 %(1 count) 160 Linearity 1 count Re-calibrate as necessary. Sample rate 3 samples/sec Operating temperature range 0 50 C Temperature stability 100 ppm/C Loop Volt Drop 3.9 4.3 4.8 V R25R25 *To ensure maximum accuracy, re-calibrate periodically. R14R14 R13R13 R12R12 R11R11 CONNECTOR SOURCING GUIDE ToTopp rightright handhand cornercorner ofof thethe pcb.pcb. METHOD Screw Terminals - No Connector Required DIMENSIONS All dimensions in mm (inches) 76.0 (2.99) a 72.5 (2.85) a. 1.0 (0.04) b. 2.0 (0.08) c. 6.5 (0.26) d. 11.5 (0.45) e. 13.0 (0.51) Panel cut-out 72 x 40 (2.83 x 1.57) Maximum panel thickness 3mm (0.12). 51.0 (2.01) b c 61.5 (2.42) d e 51.0 (2.01) 5.7 OFFSET SPAN (0.22) REAR VIEW 1 6 5 7 8 2 10 3 4 9 3.0 71.5 (2.81) (0.12) ON BOARD SOLDER LINKS 39.0 (1.54) 44.0 (1.73) 24.0 (0.94) 40.5 (1.59) 24.0 (0.94) 24.5 (0.96) DS DP1 DP2 DP3 I- I+LASCAR ELECTRONICS LTD. LASCAR ELECTRONICS INC. LASCAR ELECTRONICS (HK) LIMITED MODULE HOUSE, WHITEPARISH, 3750 West 26th Street, FLAT C, 5/FL., LUCKY FTY. bldg., 63-65 HUNG TO ROAD WILTSHIRE SP5 2SJ UK Erie, PA 16506 USA KWUN TONG, KOWLOON, HONG KONG TEL: +44 (0)1794 884567 FAX: +44 (0)1794 884616 TEL: +1 (814) 835 0621 FAX: +1 (814) 838 8141 TEL: +852 2797 3219 FAX: +852 2343 6187 E-mail: sales lascar.co.uk E-mail: us-sales lascarelectronics.com E-mail: b4lascar samsongroup.com.hk TERMINAL FUNCTIONS 1. I+ Positive current input. 2. I- Negative current input. 3. DP3 1.000 4. DP2 10.00 Decimal point inputs. 5. DP1 100.0 6. DS Decimal Point select. Connect to required DP input to display decimal point. CALIBRATION The meter is supplied calibrated to read 000 for 4mA loop current and 1000 for 20mA. To re-calibrate: 1. Apply 4mA to I+/I- and adjust OFFSET to read 000. 2. Apply 20mA and adjust SPAN to read 1000. 3. Repeat steps 1 and 2 until there is no more adjustment of SPAN and OFFSET required to give desired readings. SAFETY To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the modules pins must not exceed 60Vdc. If voltages to the measuring inputs do exceed 60Vdc, then fit scaling resistors externally to the module. The user must ensure that the incorporation of the DPM into the users equipment conforms to the relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for Measuring, Control and Laboratory Use). VARIOUS OPERATING MODES Normally ON-BOARD LINKS: In order to quickly and easily change operating modes for Normally SHORTED OPEN different applications, the meter has severalon-board link. They are designed Cut to Solder to to be easily opened (cut) or shorted (soldered). OPEN SHORT The DPM 942 is powered from the 4-20mA signal loop and needs no other power supply. Ensure correct polarity when connecting. I+ 1 4 I+ DP2 4-20mA DP2 selected in this example. DPM 942 Transmitter I- 2 6 I- DS PANEL FITTING Specifications liable to change without prior warning DPM 942 Issue 5 August/2002 M.C. Applies to DPM 942/3