Algas-SDI Operations and Maintenance Manual – P/N – 54702
7-15
7.
Troubleshooting
PROBLEM
CAUSE
SOLUTION
Mixer shuts down on high air
pressure
First-stage air regulators are set too
high or are malfunctioning.
Reduce air pressure setting or
check/repair/replace first-stage
air regulator
Mixer shuts down on high gas
pressure
First-stage gas regulators are set too
high or are malfunctioning.
Reduce gas pressure setting or
check/repair/replace first-stage
gas regulator
Mixer shuts down on low air
pressure
Air compressor is turned off
Turn the air compressor on and
ensure proper operation
First-stage air regulator is set too low
or is malfunctioning
Increase air pressure setting or
check/repair/replace first-stage
gas regulator
Air inlet shut-off valve is closed
Open the valve
Mixer is overdrawn on startup
Open mixed gas outlet valve
slowly on initial start up
Mixer shuts down on low gas
pressure
First-stage gas regulator is set too low
or is malfunctioning
Increase gas pressure setting
or check/repair/replace first-
stage gas regulator
The pump pressure to the vaporizer is
low or pump isn’t functioning
Check pump operation and
incoming lines
Vaporizer outlet valve is closed
Open the valve
Gas inlet shut-off valve is closed
Open the valve
Vaporizer shuts down on safety or is
not up to temperature
Refer to vaporizer O&M to
ensure proper operation
Mixer is overdrawn on startup
Open mixed gas outlet valve
slowly on initial start up
Safety shut off valves don’t
open on start
Instrument air pressure loss
Ensure instrument air supply
valve is open and regulator
pressure setting matches
datasheet
Safety solenoid valves malfunctioning.
Check wiring and/or repair
solenoid valve(s)
Mixer shuts down on
instrument under range or
over range
Bad connection between instrument
and PLC control box
Check all wiring between
instrument and tighten any
loose connections
Instrument failed
Check instrument and
repair/replace as necessary
