Martel Electronics 135 - Manual (Page 59)

Bipolar Frequency Calibration
Figure 6
Pressure Module
Figure 7 shows a typical connection for calibrating a loop powered
pressure transmitter with a Model 130/135.
Figure 7
Application Notes 130/135 55
Field Device
Frequency
Input
Terminals
100K
1uf
Pressure
Module
Shop Air
Supply
+ -
Vent to
Atmosphere
DP
Transmitter