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DPM 742-BL
4-20mA Loop Powered Indicator with Backlighting
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 3 2 1
DP 3 2 1
DP 3 2 1
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.
Other
Device
1
4-20mA
Transmitter
I+
I-
I+
DPM 742-BL
I-
4-20mA
Transmitter
I+
I-
I+
DPM 742-BL
I-
Other
Device
Measuring a 4-20mA loop current.
V+
S BL
2
Measuring a 4-20mA loop current
with other devices in the loop.
I+
I+
BL+
4-20mA
Transmitter
DPM 742-BL
I-
I-
BL-
R
R = V+ - 5V
30mA
0V
Measuring a 4-20mA loop current with LED
Backlighting switched on.
Note:
If the backlighting supply voltage (V+ - 0V) = 5V,
then no resistor R is required, and connect BL- to 0V.
Specifications liable to change without prior warning
DPM 742-BL
Issue 1
August/2002
M.C.
Applies to DPM 742-BL/1
www.martelcorp.com
Page 4 of 4
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.lascarelectronics.com Page 4 of 4
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