Halytech
hydroSpider2 User’s Manual v1.23
Page 41
5.6.1
4-20mA Calibration
Applies to
: Analogue (4-20mA)
The hydroSpider’s 4-20mA channels are factory calibrated, therefore on the 4-20mA calibration
screen you only need to enter the values that correspond to the sensors 4mA and 20mA readings.
The hydroSpider will then automatically work out the correct scaler and offset values.
For example
: A 4-20mA pressure sensor is measuring water level the 4mA reading corresponds to 0
metres, and a 20mA reading which corresponds to 10 metres. The number 0 is entered into the first
field, and the number 10 is entered into the second field. This channel will now produce values
between 0 metres and 10 metres.
5.6.2
Manual calibration (counter)
Applies to
: Counter, Event, Difference, Quadrature
Manual counter calibration screenshot
Manual counter calibration has the following fields:
Pulses per unit
: This option specifies how many pulses represent one unit of measure.
Desired value
: This is used to make the hydroSpider’s reading match the current reading on
the sensor (if given). Simply enter the sensor’s reading as the desired value and the
hydroSpider will start counting from there.
This page also shows the current calibrated value, which can be updated at any time by clicking the
Update
button.
