User Manual

JUMPER LINKS
DP1 Displays decimal point DP1 (199.9).
DP2 Displays decimal point DP2 (19.99).
DP3 Displays decimal point DP3 (1.999).
Lk1 Used during calibration (see above).
DP
321
DP
321
DP
321
Specifications liable to change without prior warning DPM 742-BL Issue 1 August/2002 M.C. Applies to DPM 742-BL/1
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APPLICATIONS
The DPM 750-BL is powered from the 4-20mA signal loop and needs no other power supply. The LED backlighting requires a
separate d.c. power supply. Ensure correct polarity when connecting.
Measuring a 4-20mA loop current.
Measuring a 4-20mA loop current
with other devices in the loop.
www.lascarelectronics.com
4-20mA
Transmitter
4-20mA
Transmitter
I+ I+
I+
I- I-
I-
DPM 742-BL
I+
I-
DPM 742-BL
Measuring a 4-20mA loop current with LED
Backlighting switched on.
If the backlighting supply voltage (V+ - 0V) = 5V,
then no resistor R is required, and connect BL- to 0V.
Note:
4-20mA
Transmitter
I+
I+ BL+
V+
0V
I-
I- BL-
DPM 742-BL
S
BL
R
R=
30mA
V+-5V
Other
Device
1
Other
Device
2
DPM 742-BL 4-20mA Loop Powered Indicator with Backlighting
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com