Martel Electronics 135 - Manual (Page 60)

Transmitter Calibration Using Loop Power Supply (LPS)
Figure 8
Application Notes
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Pressure
Module
+
-
HI LO
Vent to
Atmosphere
Special
mA Connection
Hand Pump
Instrument
Under Test
24VDC
4-20mA
Loop Power
Connection
Loop Power Supply
(LPS)
Stored in Pouch
Pressure Connection 1/8” FNPT