Martel Electronics BetaGauge 3II - Manual (Page 51)

Basic Operations 3-16
Dry Contacts
To detect dry contact trips, you must connect dry
contacts to the milliamp input of the calibrator’s DC
module. The BetaGauge II will detect a dry contact trip
when the input resistance crosses the 800 Ohm
threshold.
Hints for Accurate Trip Measurements
There are three areas where it is helpful to have detailed
knowledge before setting up a pressure trip detection:
 Selecting a field instrument (hand pump or pressure
controller)
 Adjusting the pressure source
 Ramping the pressure signal
Field Instrument Selection
You can use either a hand pump or a pressure controller
as a pressure source for detecting pressure trips. Use the
following guidelines when selecting either of these field
instruments:
 Hand Pump. Select a hand pump with a Vernier
adjustment knob so that you can make fine
adjustments.
 Pressure Controller. Select a pressure controller
that has an easy micro-adjustment method.