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 TM 55-1905-219-14-9
4-64.1. TANK LEVEL INDICATION-RECEIVER-MAINTENANCE INSTRUCTIONS
(Continued).
LOCATION
ITEM
ACTION
REMARKS
ADJUSTMENTS AND ALIGNMENTS
17.
GENERAL.
a. Adjustment and alignments for the TLI systems are performed during initial installation, when
troubleshooting procedures indicate that a control is out of adjustment, and whenever a meter is replaced or
repair is made in an alarm circuit in a receiver module or receiver panel. Adjustments and alignments consist
of meter calibration procedures (which include zero adjustment, full-scale deflection adjustment, and fluid level
calibrations) and alarm adjustments.
WARNING
When performing adjustment and alignment procedures in fluid
tanks that contain or have contained in-flammable or explosive
fluids, ground the tank and observe all precautions for a
hazardous area.
b.
Meter Calibrations.
(1) Fluid level meters on the receiver modules and receiver panels of a TLI system-have their
calibration marks made at the factory on the basis of data supplied by the installing activity or can be marked in
by ship's personnel during installation or during replacement for corrective maintenance purposes. The
following calibration instructions provide a means of calibrating the zero, full-scale deflection, and intermediate
fluid level markings on 4-1/2 inch square meters.
(2) The instructions provided for the calibration procedures described a procedure in which meter
calibrations are initially made in pencil on unmarked meter faces and then with a more permanent marking
device.
(3) Zero Adjustment. Before other calibration or adjustment procedures are performed, meters shall
be zero adjusted in accordance with the procedure below.
(a) To zero adjust a meter, using a screwdriver, adjust the ZERO adjustment screw on the
front of the meter to its mid-position (if meter has no 0-mark) or to the setting that caused deflection to the O-
mark (if meter has one). If there is no O-mark, remove the four frame mounting screws securing the face
frame and glass to the
4-1348
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