User manual

Model: 2100 &2300 Series
2100UM22.DOC Rev: 2.2
- 26 -
5.0 TROUBLESHOOTING
CONDITION DO THIS
1. DISPLAY MENU SHOWS:
Error: No Xmtr Signal
The unit is not receiving a frequency signal from the
remote PMC-2000 level transmitter in the probe head:
Check wiring.
If wiring checks out: call Arjay Technical Support. An
adjustment may be made at the controller.
2. DISPLAY MENU SHOWS:
Error: Setup Values Bad
This indicates that one of the calibration or setup
parameters has been corrupted. Compare ALL
parameters with the table in Section 6 to find out which
one. Re-enter it.
Call Arjay Technical Support
3. DISPLAY MENU SHOWS:
Error: pF out of range
The calculated capacitance is out of the legal range:
Check if the A,K,C values in the unit correspond to the
A,K,C values of the PMC-2000 transmitter.
Check the integrity of the Teflon sheath of the probe. If
this has been damaged, water could cause an electrical
short circuit between the probe within the Teflon sheath
and the ground reference. In this case a very high
capacitance is usually registered. Check the Xmtr
frequency in the Diagnostics menu. If the frequency is
much below 19,000Hz then a short circuit should be
suspected. To confirm: Open the probe head and
disconnect the blue wire from the probe to the PMC-2000.
Using a DVM, measure the resistance between the
enclosure case and the probe tip. It should read infinite
resistance or OL. Make sure that fingers and hands do
not touch the metal portion of the probes of the DVM since
this could show a lower resistance: 1-10mohms.
Contact an Arjay Representative.
4. The level reading is erratic or
unstable
Check the Slope value. If this is lower than about 0.5pF
per percent then check if the level displayed agrees with
the actual level in the vessel at a number of different
levels. If so, then check if the probe is being splashed by
incoming liquid or if there are moving mixer parts
(especially metallic) close to the probe. If this is true, then
try increasing the Filter time setting. If this is not enough,
and the cause of the disturbance cannot be rectified then
a concentrically shielded probe must be used.
5. Readings are not accurate i.e. the
displayed values are not accurate
as the level moves away from the
calibration points.
For probes without a factory supplied concentric shield,
make sure the probe is parallel to its ground reference
which may be the tank wall or the inside of a stilling pipe
(if probe is installed in a pipe). See Probe Installation
SECTION 2.2 for more details.
For probes with a factory supplied concentric shield, make
sure the pressure equalizing slots / holes in the shield are
unobstructed i.e. the liquid level inside and outside the
shield are always the same.