Rosemount P300, Installation And Operation Manual

Page: 26 / 48

Rosemount Model P300 Pressure Validator
4-6
To perform a Pressure/Voltage test, refer to Figure 4-3 and Figure 4-4
above for connection diagrams and proceed as follows.
1. Ensure that the validator is off before making any connections.
2. Open the vent valve on the validator.
3. If the validator has a pressure/vacuum switch, set the selector
switch to + or – as required.
4. Connect the transmitter to the reference pressure port using a
pneumatic hose.
5. Connect the test leads as shown for either an externally powered
or validator-powered test. Avoid contact with the leads and
terminals.
6. Turn on the validator.
7. Set the validator to
DUAL DISPLAY
mode,
PRESSURE
/
VOLTAGE
, by
pressing the
P
and
V
keys simultaneously.
8. Press the
ZERO
key to zero the display before applying pressure.
9. Close the vent valve.
10. Apply pressure with the pressure pump until it is within range of
the desired pressure.
11. Fine tune the pressure with the fine pressure adjuster to the
precise pressure desired.
12. Take the voltage reading.
13. Open the vent valve to release pressure before disconnecting.
14. Remove presure and vent the transmitter validator and all lines
before disconnecting any pressure lines.
15. Remove pressure and open the vent valve before switching the
pressure/vacuum output, if the validator is equipped with one.
NOTE
To maximize battery life, disconnect the transmitter from the validator
as soon as tests are completed.
NOTE
If the applied voltage rises above 55V, the display flashes to indicate an
over-range condition.
See Safety Messages on page 4-1 for complete warning information.