Martel Electronics DPM942 User Manual
DPM 942
R25
R11
R12
R13
R14
Top right hand corner of the pcb.
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 profilebezel and clips provided.
19mm (0.75“) Digit Height
Programmable Decimal Points
Low Volt Drop
Simple Screw Terminal Connections
CUSTOM SCALING
For alternative scalingto the standard 0 - 1000, cut Link 8
and short Link 7. Add two resistors R12 and R13 which
will set the basic scale of the meter. The highest practical
value for the R12 and R13 series combination is 12R. To
select your desiredscaling, use the following formula:
R12 + R13= Full Scale reading at 20mA
160
Re-calibrate as necessary.
R25
R14
R13
R12
R11
Top right hand corner of the pcb.
Standard Meter DPM 942
Specification Min. Typ. Max. Unit
Accuracy (overall error) * 0.05 0.1 %(±1 count)
Linearity ±1 count
Sample rate 3 samples/sec
Operating temperature range 0 50 °C
Temperature s 100 ppm/°C
tability
Loop Volt Drop 3.9 4.3 4.8 V
*To ensure maximum accuracy, re-calibrate periodically.
CONNECTOR SOURCING GUIDE
METHOD Screw Terminals - No Connector Required
Stock Number
DIMENSIONS
44.0 (1.73)
39.0 (1.54)
All dimensions in mm (inches)
76.0 (2.99)
72.5 (2.85)
40.5 (1.59)
51.0 (2.01)
61.5 (2.42)
51.0 (2.01)
24.0 (0.94)
71.5 (2.81)
24.0 (0.94)
Ø5.7
(0.22)
24.5 (0.96)
Ø3.0
(0.12)
a
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).
b
c
d
e
OFFSET SPAN
6
10
DS
REAR
VIEW
1
578
DP2
DP3
DP1
ON BOARD
SOLDER LINKS
2
3
4
9
I-
I+
LASCAR ELECTRONICS LTD.
MODULE HOUSE, WHITEPARISH,
TEL: +44 (0)1794 884567 FAX: +44 (0)1794 884616
WILTSHIRE SP5 2SJ UK
E-mail: sales@lascar.co.uk
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com
LASCAR ELECTRONICS INC.
3750 West 26th Street,
TEL: +1 (814) 835 0621 FAX: +1 (814) 838 8141
Erie, PA 16506 USA
E-mail: us-sales@lascarelectronics.com
LASCAR ELECTRONICS (HK) LIMITED
FLAT C, 5/FL., LUCKY FTY. bldg., 63-65 HUNG TO ROAD
KWUN TONG, KOWLOON, HONG KONG
TEL: +852 2797 3219 FAX: +852 2343 6187
E-mail: b4lascar@samsongroup.com.hk
TERMINAL FUNCTIONS
1. I+ Positive cur rent 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 requiredDP input todisplay decimal point.
CALIBRATION
The meter is suppliedcalibrated to read 000for 4mA loopcurrent and 1000for 20mA.
Tore-calibrate:
1. Apply 4mA toI+/I- and adjust 'OFFSET' to read 000.
2. Apply 20mA andadjust 'SPAN'to read 1000.
3. Repeat steps 1and 2 until there is no moreadjustment of 'SPAN' and 'OFFSET' requiredto give desired readings.
SAFETY
To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module’s 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 user ’s
equipment conforms to the relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for Measuring, Controland Laboratory Use).
VARIOUS OPERATING MODES
ON-BOARD LINKS: In order to quickly and easily change operating modes for
different applications, the meter has several "on-board links". They are designed
to be easily opened (cut) or shorted (soldered).
The DPM 942 is powered from the 4-20mA signal loop and needs no other power
supply. Ensure correct polarity when connecting.
1
4-20mA
Transmitter
I+
I-
I+
2
I-
DP2
DPM 942
DS
PANELFITTING
Normally
SHORTED
Cut to
OPEN
4
Normally
OPEN
Solder to
SHORT
DP2 selected in this example.
6
Specifications liable to change without prior warning DPM 942 Issue 5 August/2002 M.C. Applies to DPM 942/3
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