Fisher 4195 KB Series Instruction Manual page 37

4195KA, KB, and KC Series
Fault
6. Controller will not attain full
output range
7. Controller remains at full output
8. Controller remains at zero
output
3. Slide the process scale (key 61) downward so that
the top of the slot touches the set point indicator. De-
flect the lower portion of the slot outward and carefully
5–4
Table 5–1. T roubleshooting Chart (continued)
Possible Cause
6.5 Nozzle pressure leak
6.6 Leak in nozzle pressure tubing
6.7 Relay malfunction
7.1 Supply pressure too high
7.2 Output gauge not functioning
7.3 Sensor or linkage failure
7.4 Flapper mis-alignment
7.5 Relay failure or restriction in
nozzle passage
8.1 Gauge not functioning
8.2 Sensor or linkage failure
8.3 Flapper misalignment
8.4 Relay malfunction
8.5 Nozzle pressure leak
Check
6.5 Check for nozzle tubing leaks
with a water bottle and soap
solution with the nozzle capped by
the flapper. Press the nozzle cap
(key 23) gently to ensure the
nozzle assembly is sealing. Ensure
the relay nozzle tubing nut (key 18)
is tight and the manifold screws
(keys 34 and 131) are tight
6.6 Using soap solution, check for
leaks in the nozzle tubing assembly
6.7 Manually push the flapper
away from the nozzle. The output
pressure should be zero. Cap the
nozzle. The output should increase
rapidly to within 0.5 psig (35 mbar)
of the supply pressure
7.1 Check with an external
pressure gauge
7.2 Reduce supply pressure to 0
psig to see if output gauge
responds
7.3 Vary the process pressure and
observe the flapper for movement.
Inspect the sensor and linkage for
damage
7.4 Vary the process pressure and
verify that the nozzle can be
uncapped by the flapper
7.5 Loosen the relay nozzle tubing
nut (key 18) with full supply
pressure
8.1 Verify that the supply pressure
is at its correct value and that the
controller output is zero
8.2 Vary the process pressure and
observe the flapper for movement.
Inspect the sensor and linkage for
damage
8.3 Vary the process pressure and
verify that the nozzle can be
capped by the flapper.
8.4 Check for air at the nozzle.
Cap the nozzle and see if the
controller output increases to within
0.5 psig of supply pressure
8.5 Check for nozzle tubing leaks
with a water bottle and soap
solution with the nozzle capped by
the flapper. Press the nozzle cap
(key 23) gently to ensure the
nozzle assembly is sealing. Ensure
the relay nozzle tubing nut (key 18)
is tight and the manifold screws
(keys 34 and 131) are tight
slide the scale up and off, clearing the set point indica-
tor as shown in figure 5–1.
Correction
6.5 Tighten the relay nozzle tubing
nut (key 18). Tighten the manifold
screws (keys 34 & 131). Replace
the nozzle assembly (key 21),
O-ring (key 24), or set point beam
assembly (key 23) as necessary if
leaking
6.6 Replace faulty parts as
necessary. Clean out the relay
primary orifice with the cleanout
wire attached to the relay to ensure
the orifice is not clogged
6.7 If the output does not change
as described, remove the relay.
Replace the O-rings if necessary.
Replace relay if necessary
7.1 Supply pressure regulator or
gauge may have to be replaced
7.2 If output gauge does not
respond, replace it
7.3 Repair or replace parts as
necessary
7.4 Perform flapper alignment
procedures
7.5 If the output pressure remains
at the supply pressure, repair or
replace the relay. If the output
pressure moves to 0 psig, clean or
replace nozzle or nozzle tubing.
8.1 Replace gauges as necessary
8.2 Repair or replace parts as
necessary
8.3 Perform flapper alignment
procedures
8.4 Clean out the relay primary
orifice with the cleanout wire
attached to the relay to ensure the
orifice is not clogged. If the problem
persists, replace the relay
8.5 Tighten the relay nozzle tubing
nut (key 18). Tighten the manifold
screws (keys 34 & 131). Replace
the nozzle assembly (key 21),
O-ring (key 24), or set point beam
assembly (key 23) as necessary if
leaking