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Problem
Flow alarm will not clear.
Unit leaks at the facility
inlet/outlet, reservoir drain,
filter cartridge drain, or the
DEI cartridge.
Fluid in filter cannister or
DEI cartridge appears
contaminated.
Temperature calibration
appears to be off, either in
remote or local mode.
Unit has missing or bent
leveling foot.
CB trips during ramp to set
point.
Possible Cause
NESLAB factory sets all four flow alarms to
3.8 lpm. It is possible that flow alarm
setpoints for loops not in use are not set to
zero, or flow alarm for loops in use may be
set too high.
The fittings may not be tight enough or
Teflon
®
tape is not applied, causing
leakage.
The thermal fluid specified for use in the
Steelhead unit family naturally degrades
over time. This degradation can cause fluid
contamination and possible damage to the
unit if the fluid is not regularly replaced.
Fluid replacement is part of routine mainte-
nance for the unit.
Because of temperature gradients inside
the unit and heat transfer to the environ-
ment through the fluid lines, the tempera-
ture at the tool may be different than the
temperature at the unit.
Leveling foot jam nut not tightened se-
curely to case. This could cause foot shaft
to loosen and lower. The lowered leveling
foot could become bent during movement
of the unit or could fall out completely.
Excessive flow through DI loop, causing
excessive heater draw.
Recommendation
Verify the alarm setpoint for the
process loops not in use are set
to zero (off). Verify that the alarm
setpoints for the process loops
in use are set to the desired
value.
These fittings are used during
facilitization should be prepared
and tightened in accordance
with the instructions in this
manual.
Flush out the thermal fluid loop
(including the lines to the tool)
and replace with new fluid as
specified in this manual.
Contact NESLAB service for a
field verification of temperature
calibration .
Ensure all leveling foot jam nuts
are securely tightened to the
case.
Regulate DEI towards off posi-
tion.
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