Hanna Instruments HI 2550 User Manual

Page 44

mV CALIBRATION

V CALIBRATION

(((((for technical personnel only

for technical personnel only

for technical personnel only)))))

All the instruments are factory calibrated for mV.
Hanna’s ORP electrodes are interchangeable and no mV calibration is
needed when they are replaced.
If the mV measurements are inaccurate, mV recalibration should be
performed.
For an accurate recalibration, contact your dealer or the nearest Hanna
Customer Service Center or follow the instructions below.
A two-point calibration can be performed at 0.0 mV and 1800.0 mV.
• Attach to the BNC connector a mV simulator with an accuracy of

±0.1 mV.

• With the instrument off, press and hold down the CAL & keys,

then power on the instrument. The “CAL” tag will appear and the
secondary LCD will show “0.0 mV“.

• Set 0.0 mV on the simulator.

When the reading is stable and close to the selected calibration
point, “READY” tag will appear and “CFM” tag will blink.

• Press CFM to confirm. The secondary LCD will display

“

1800 mV

“

• Set 1800.0 mV on the simulator.

When the reading is stable and close to the selected calibration
point, “READY” tag will appear and “CFM” tag will blink.

• Press CFM to confirm. The

instrument

memorize calibration and

restart

to measurement mode.

Notes:• If the reading is not close to the selected calibration point,

“WRONG” tag will blink. Verify calibration condition or
contact your vendor if you can not calibrate.

• Pressing CAL key during calibration process the instrument

quit calibration mode and restart to measurement mode
without memorizing calibration.