Tronair 5731, Operation & Service Instructions

Page: 63 / 119

Model: 5731
Hydraulic Power Unit
08/2016 | Rev. 08 Page | 58
12.0 CALIBRATION OF INSTRUMENTATION
All gauges on the Hydraulic Power Unit can be either returned to Tronair for calibration or certified by the end user if proper
calibration equipment is available. Gauges returned to Tronair for calibration will be tested with standards traceable to N.I.S.T.
(National Institute of Standards and Technology). Tronair recommends calibration of instrumentation at yearly intervals, but
actual calibration dates may be based upon frequency of use and the end users quality system. For information on returning
gauges for calibration, Reference
12.1

Source of Calibration .
12.1
SOURCE OF CALIBRATION
TRONAIR , Inc. Telephone: (419) 866-6301 or 800-426-6301
1740 Eber Road Fax: (419) 867-0634
Holland, Ohio 43528-9794 USA E-mail: sales@tronair.com
Website: www.tronair.com
12.2
ANALOG PRESSURE GAUGE

System Pressure
12.2.1 Self Calibration
An accurate pressure calibration gauge is required for calibration of the System Pressure gauge. There are two methods
available. Method A can be used if the HPU is equipped with a calibration port
(Option Q) . Method B must be used if the HPU
is not equipped with a calibration port. Follow the necessary steps below.
NOTE: Method A can only test the gauge up to the rated operating pressure of the HPU (3 ,5 00 psi).
Method A: Shut off HPU and disconnect from aircraft. Close the calibration port Shut-off Valve on the instrument panel of
the HPU. Attach the “Master” calibration gauge to the
Calibration Port on the instrument panel.
Set up the HPU as follows:
Reservoir Selector Valve .............................................. Set to HPU Reservoir
Bypass Valve ............................................................... Open
Pressure Ball Valves (at rear of unit) ............................ Closed
Return Ball Valves (at rear of unit) ............................... Closed
Start the HPU. Open the calibration port Shut-off Valve. Close the Bypass valve to build system pressure. Record gauge
values at the designated increments.
Open the Bypass valve.
Shut off the HPU and close the calibration port Shut-
off Valve before disconnecting the “Master” calibration gauge.
Method B: Shut off the HPU and disconnect it from the power source. Remove the Hydraulic Panel from the front instrument
panel (four screws). Disconnect the hose from the System Pressure gauge (remove gauge from panel if necessary). Attach
calibration test equipment to the gauge and record gauge values at the designated increments.
12.0 Calibration of Instrumentation continued on following page.
SYSTEM PRESSURE GAUGE (HC-2144)
Applied Pressure
(System Pressure Gauge)
(psig)
Minimum
Acceptable
(psig)
Maximum
Acceptable
(psig)
Gauge Movement
(Direction)
Indicated Pressure
(Calibration Gauge)
(psig)
1000 910 1090 Increasing
2000 1910 2090 Increasing
3000 2910 3090 Increasing
4000 3910 4090 Increasing
5000 4910 5090 Increasing
6000 5910 6090 Increasing
5000 4910 5090 Decreasing
4000 3910 4090 Decreasing
3000 2910 3090 Decreasing
2000 1910 2090 Decreasing
1000 910 1090 Decreasing
Allowable operating tolerance: +/- 1.5% of full scale (90 psig) at room temperature (70

F).