INM MTL 130-0202 Rev 4
19
continued
SYMPTOM
POSSIBLE CAUSE
TEST
ACTION
Fault code 262144.
1. Reactor temperature
outside spec.
1. Examine display of
temperature controller
for fault status – As per
section 7.8
1. Replace controller
and re-tune if
necessary - contact
your local MTL
Gas sales office for
instructions.
Fault code 524288
1. Electronics unit has
failed to read the KIM.
1. Remove KIM,
check connections and
replace.
1. Check for fault code.
Fault code remains
2. KIM has failed.
2. Replace sensor and
KIM.
2. Check for fault code.
Fault code remains
3. Communication
error.
3. Replace electronics
unit as per section 7.9
3. Contact your local
MTL Gas sales office
representative if fault
code remains.
Concentration alarm
relay outputs are not as
expected.
1. User programmable
alarm settings are
incorrect.
1. Refer to manual to
check alarm settings.
1. Adjust alarm
settings as required.
Not all functions
operate e.g. keypad
problems, display
failure, LED failure, etc.
1. Electronics unit has
corroded connections.
1. Check/ clean
connections on the
backplane and in the
electronics.
1. Ensure Chlorine
is kept out of the
enclosure.
2. Display failed
2. Replace electronics
as per section 7.9
2. Return faulty unit
to your local MTL Gas
sales office.
Katharometer Identity Module (KIM)
6.4 Checking the katharometer
The simplest way to identify a possible katharometer fault is to measure the volts appearing
across the measurement elements.
6.4.1 Checking the voltage across the elements
With the instrument powered up, the voltage across each terminal pair 1 & 2, 3 & 4, 5 &
6, should be somewhere between 2.5 and 4.5 volts. If this is the case, and a fault code
indicates some excessive voltage (A/D counts <>4095) then faulty electronics are indicated.
6.4.2 Checking the resistance of the elements
If a katharometer fault is indicated, disconnect its wires from the electronics and check the
resistance across each measuring element using a low voltage resistance tester –
DO NOT
USE A HIGH VOLTAGE INSULATION RESISTANCE TESTER.
The resistance across wire pairs 1 & 2, 3 & 4, 5 & 6, should be somewhere between 1000
ohms and 2500 ohms. If it is outside of these values, then it is unlikely to be repairable. If
the resistances are within specification, but the voltages across the elements are outside
of specification, it may be that the katharometer is contaminated, and may be recoverable
through cleaning. The majority of likely contaminants of the measurement elements and
reactor tube are water soluble, so irrigating them with water is usually sufficient to clean
them. It is more convenient to do this in the workshop or laboratory, which means removing
them from the katharometer/reactor assembly.
