Practical Instrument Electronics 820-ELITE - Manual (Page 23)

Page 21
Simulate pH probes into transmitters & analyzers
Use the pH simulator to verify proper operation of pH devices
before you place a probe into a calibrated buffer. Adjusting the
pH transmitter or analyzer without a probe allows you to make
sure the device is calibrated and operating correctly. The
820-ELITE simulates 0.000 to 14.000 pH @ 25°C corresponding
to 414.12 to -414.12 mV.
Once the pH instrument has been adjusted against the PIE
820-ELITE reconnect the pH probe and check it against the
proper buffer (typically 7 pH). If the instrument zero point
requires more than the manufacturer’s recommendations
(typically within 0.5 pH) it is time to clean or replace the probe.