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65
GF 9950-10 Six Channel Transmitter
Condition
Possible Causes
Suggested Solution
Wrong Sensor
Incorrect sensor installed on channel
Connect correct sensor to channel
Sensor Type set incorrectly in 9950
Set correct sensor TYPE in INPUT menu
(Refer to page 11)
Wrong Code
Wrong password entered
Enter correct password (Refer to page 12)
K-Factor Out Of Range
K-Factors cannot be set to 0
Enter K-Factor from 0.0001 to 99999
Backlight inoperative
Backlight turned OFF
(
NOTE:
Backlight can turn off
automatically in AUTO mode)
Set BACKLIGHT to LOW, HIGH, AUTO
LOW or AUTO HIGH in OPTION menu.
Relays inoperative
Relay Module installed incorrectly
Remove and reseat Relay Module
Wrong settings in RELAY menu
Use test relay to verify relay operation then
check relay settings.
Relay always on
Hysteresis value too large
Change the hysteresis value
Defective Relay Module
Replace Relay or Modbus Module
– – – – –
Measurement exceeds display
capability
Increase Flow units time base
Change unit of measure
Missing Module
Conductivity or Dual Channel 4 to 20
mA Module or Modbus Module is not
installed in the Module Slot
Install the module in the correct slot
Wrong Module
The wrong Module (Conductivity or
Dual Channel 4 to 20 mA or Modbus
Module) is installed in the slot
Replace module with the correct module
No Probe
(pH/ORP only)
9950 "cannot communicate" to sensor
• Check wiring
• Install or replace sensor
Missing sensor or bad temperature
element
No Sensor
(Flow, Cond/Res, Press,
Level, Temp, 4-20 mA,
Sal, Batch, DO)
9950 "cannot communicate" to sensor
• Check wiring
• Install or replace sensor
Check Preamp
9950 "cannot communicate" to
the preamp
Check wiring or replace preamp
Backlight of Screen is
RED
Error is detected or Relay is activating
the red backlight
Correct error condition
Missing Cap
Dissolved Oxygen sensor is missing
the sensor cap
Reinstall Dissolved Oxygen sensor cap
Replace Cap
Dissolved Oxygen sensor cap has
expired
Install new Dissolved Oxygen sensor cap
Troubleshooting