Hanna Instruments PCA 310 - Manual (Page 53)

53
CALIBRATE THE ANALOG OUTPUTS
The analog output is factory calibrated. Recalibration is not
needed when the output type is changed.
If, for any reason, a new calibration has to be performed,
each output type could be easily calibrated.
To calibrate the current type analog outputs, follow the steps:
• Connect an ammeter to the pin 1 and 2 /
pin 3 and 2 of the output connector.
• Enter in menu mode and select “General
Menu” - “Analog Output” sub-menu.
• Select the analog output type to one current
type 0-20mA or 4-20 mA.
• Select “Cal. Analog Out Max” and press “Up” and “Down”
keys until the read value is equal with 20 mA.
• Save the new coefficients by pressing “CFM” key.
• Select “Cal. Analog Out Min” and press “Up” and
“Down” keys until the read value is equal with 0mA or 4 mA.
The analog output source current and when calibrating 0mA,
a positive value must be set for current (0.1mA for example)
and then the current must be slowly decreased to 0mA.
• Save the new coefficients by pressing “CFM” key.
Note: The analog output calibration is not allowed if the analog
output type is set to “Dosing”.
Pressing for longer time the arrow keys will increase the variation
speed of the analog output.