2.
Press CALIBRATE HIGH POINT button and place probe in high ORP solution. Default high
setpoint is 472mV. Press HOLD when readings are stable then confirm setpoint then
CALIBRATE AND SAVE button.
Turbidity Calibration
The turbidity sensor is calibrated using solutions with a turbidity of 0 ntu (distilled water) and a high
value between 100 ‐ 300 ntu's. These solutions can be prepared by diluting a concentrated
formazin solution. Beware, formazin is a suspected carcinogen. Always wear rubber gloves when
handling formazin solutions. Note: Always clean the glass tube before calibration – see
maintenance. To calibrate the turbidity sensor, proceed as follows:
1.
Select TURBIDITY parameter and CALIBRATE LOW POINT button and place in distilled water
default setpoint 0ntu. Press HOLD when readings are stable then confirm setpoint then
CALIBRATE AND SAVE button.
2.
Press CALIBRATE HIGH POINT button and place probe in high Turbidity solution from 10 –
600NTU. Default high setpoint is 200NTU. Press HOLD when readings are stable then
confirm setpoint then CALIBRATE AND SAVE button.
Depth calibration
If the optional depth sensor is fitted then it will also require calibration. To perform the depth
calibration you need to lower the probe to a known depth in the water. This can be done by placing
a mark on the probe cable at a measured distance from the bottom of the probe assembly then,
making sure that the probe cable is vertical, lower the probe until the mark is at the surface of the
water.
1.
Select DEPTH parameter and CALIBRATE LOW POINT button and leave in air, default
setpoint 0 M. Press HOLD when readings are stable then confirm setpoint then CALIBRATE
AND SAVE button.
2.
Press CALIBRATE HIGH POINT button and place probe to a known depth. Default high
setpoint is 2 meters. Press HOLD when readings are stable then confirm setpoint then
CALIBRATE AND SAVE button.
Auxiliary Channel Calibration
If the probe is fitted with auxiliary sensor/s then they may be calibrated by pressing the Aux #. The
# is the auxiliary channel number ‐ where with one additional sensor channel 1 would be
connected.
The calibration applies a straight line equation to the sensor output. To calibrate an auxiliary
channel, proceed as follows:
Press Low or High button to start the raw sensor values populating to the screen. Immerse the
probe in a calibration solution and once the reading has stabilized press HOLD. Enter the setpoint
value and press CALIBRATE AND SAVE BUTTON. 2 point calibration is required.