28
A
dvanced
S
ensor
T
echnologies,
I
nc. U.S.A.
Website:
www.astisensor.com
IOTRON
TM
Trademark of ASTI
IOTRON
TM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Scale Analog Outputs” Menu
The current process value and low & high setpoints
for each analog output for each channel is shown
based upon the current scaling setup. Each low and
high setpoint is individually adjustable. The values
entered will not be loaded for the analog output
channel until the “Update Scaling” button is clicked
and confirmed. The sensor type is indicated below
the channel number for ease of configuration to
ensure that the proper scaling choices are used.
Scaling for the pH, standard ORP, wide range ORP
and dissolved oxygen (D.O.) are expressed in the
modbus outputs that are sent from the sensor. A
conversion guide is provided in the scaling notes to
allow you to assign the scaling limits as precisely as:
0.001 pH units for the pH sensors
0.1 mV for the standard range ORP
0.2 mV for the wide range ORP
0.01 ppm & 0.1% Saturation for D.O. Sensors
NOTE: The recommended minimum difference between
the low and high setpoints is at least 1 pH unit, 100mV
for the standard ORP and 200mV for the wide range
ORP. For the dissolved oxygen sensors the minimum
recommended scaling is 1.0ppm or 10% saturation.
When you click the “
Update Scaling
” button you
will be prompted to confirm the change with yellow
dialog box. The change will take effect immediately
once you exit this dialog box.