719 Series
Users Manual
8
HART Resistor
The Calibrator has a selectable 250 Ω HART resistor to
facilitate use with HART communication devices. Use a
HART communicator when measuring mA with loop power
or sourcing mA. The HART resistor defaults to OFF.
To turn on the HART resistor:
1. With the Calibrator OFF, press O.
2. When HArt is displayed, press
V
or
U
to turn on/off.
Power Saver
The Calibrator automatically turns off after 30 minutes of
inactivity. To reduce this time or disable this feature:
1. With the Calibrator OFF, press O.
2. P.S. xx is displayed, where xx is the turn-off time in
minutes. OFF means the power saver is disabled.
3. Press
V
or
U
to decrease or increase the turn-off
time.
4. To disable, press
V
until the display shows OFF.
The Calibrator resumes normal operation after 2 seconds.
Switch Test
To perform a switch test:
Note
This example uses a normally closed switch. The
procedure is the same for an open switch but the
display reads OPEN instead of CLOSE.
1. Connect the Calibrator mA and COM terminals to the
switch using the pressure switch terminals and
connect an external pump between the Calibrator and
the pressure switch. The polarity of the terminals does
not matter.
Note
If using an external pump, connect the pump to
the Calibrator and to the input of the switch using
a tee fitting.
2. Make sure the vent on the pump is open and zero the
Calibrator if necessary. Close the vent after zeroing
the Calibrator.
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