Martel Electronics BetaGauge 321A - Manual (Page 6)

Table 1 Process Measurement Inputs
No. Name Description
1, 2 Input Terminals These terminal are used to measure current, voltage and a
contact closure for switch test.
3 P1 Pressure Port This is the connection for the internal sensor P1
4 P2 Pressure Port This is the connection for the internal sensor P2
5 RTD Probe Connector This connector is where the RTD probe is plugged in.
6 Serial Interface This is used to interface to optional external modules as
well as for RS-232 serial communications with a PC using
the LEM-232 cable(optional).
Figure 2 shows the location of the keys. Table 2 describes the function of each key.
Figure 2
Keypad
Table 2 Key Functions
No. Name Description
1 Function Keys These keys are used in various ways, primarily to config-
ure the calibrator
2 ON/OFF Key This key is used to turn the calibrator on and off
3 ZERO Key This key is used to zero pressure measurements
4 Backlight Key This key is used to turn the backlight on and off
Note: When the calibrator is turned on by pressing the ON/OFF key, it will go through a
short startup self-check routine. During that routine, the display shows the current
firmware revision level, auto shutdown status and the ranges of the 2 internal pressure
sensors. The calibrator requires a maximum of 5 minutes warm-up to rated accuracy.
Large changes in ambient temperature may require a longer warm-up period. See
section 2.3 for instructions on zeroing the pressure sensor displays. Pressure ranges
should be zeroed each time the calibrator is started.
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