INVUE GV148 LIQUID CHEMICAL CONCENTRATION MONITOR
31
User Guide | Entegris, Inc.
SYMPTOM
PROBABLE CAUSE
SUGGESTIONS
HMI will not communicate with unit when
using serial communication (continued)
GV148 monitor is not
powered on
Verify heartbeat LED is flashing
Verify product has +24V across Power
GND (gray/pink) and 24 VDC wires (blue)
HMI Server is not running or
configured correctly
Verify HMI server is running
Configure .rc file for the correct com
port and baud rate
Wrong serial port selected
Verify HMI Server lists the desired com
port in the Interface column
Configure .rc file the correct com port
Wrong device address used
Ensure device address is correct
(Default: 1)
If address is not known, select address
“All”
Concentration reading changes incorrectly
when temperature changes
Improper Temperature
Compensation Coefficients
(TCC)
Measure TCC using Temperature
Compensation tab in HMI
TCC was calculated for a different
chemistry or concentration
Wrong Primary Chemistry
Temperature (TCC) selected
Verify in HMI the Primary Chemistry
(TCC) in HMI System tab matches
chemistry being used in product
Rapid temperature change causes
spike in concentration reading
Temperature rate-of-change
is too quick
Reduce fluid temperature rate-
of-change
Allow for temperature to stabilize
before taking concentration reading
Concentrations are incorrect by small
constant offset
Sensor needs to be re-zeroed
Follow re-zero procedure in manual
Concentrations scale incorrectly
Chemical calibration is
incorrect
Verify accuracy of concentration table
in Concentration tab of HMI
4 – 20 mA output scaling is
incorrect
Verify accuracy of 4 – 20 mA output
scaling in System tab of HMI
For technical support or further assistance, please contact your authorized Entegris representative.
DIAGNOSTIC GUIDE
—
This section covers common issues and possible solutions for the concentration monitor.