Model IR4000S
26
ACTION
– Purge the detector with clean air or nitrogen, to remove any residual gas from
the gas check. Verify that the area around the detector is clear of gas and that all gas
check sources have been shut off. When gas is no longer present, the fault will clear.
F3 –Detector Non-Critical Fault
Indicates the IR400 or IR2100 detector requires attention such as cleaning the windows.
ACTION
– Remove the splash guard and carefully clean the detector windows as
described in the IR400 manual. Recalibrate the IR400 following the procedure
Calibrating
the IR400
in Section 4.4 of this manual.
F4 – Detector Communication Fault
Indicates that the IR4000S does not detect mA input from the IR400.
ACTION
–
Check the wiring between the IR400 and IR4000S. The IR4000S requires the
current loop circuit is completed. This means that the input current from the IR400 is
connected to TB1 pin 1 and also the circuit is completed from TB2 pin 1 to ground. In
most installations, the control room equipment is connected to TB2 pin 1 to complete the
circuit but if the IR4000S is used standalone then a load must be connected from TB2 pin
1 to TB1 pin 3. The load can simply be a suitable short piece of wire.
F7 – Detector critical fault
The IR4000S reads 0 mA or 1.25 mA (IR400 HART 1.25 mA configuration) from the
IR400. The low mA from the IR400 is caused by one or more of the following:
Fault F7 Cause
Action
Beam block or excessive
negative drift
Inspect windows – clean them and re-zero if necessary
CAL I/O wire (brown
wire) shorted to ground
Inspect and correct wiring
Calibration failed
Repeat calibration
Gas left after calibration
Remove calibration gas
Miswiring
Inspect and correct wiring
Voltage input below
specification
Raise the input voltage at the device to comply with product
specifications
Zero failed
Repeat zero
IR400 electronics failure
Remove the IR400 from the IR4000S. Verify that the IR400
output is 0 mA or 1.25 mA for IR400 HART 1.25 mA. If it
is, and if all troubleshooting measures have been
exhausted, including cycling power, contact the factory.
