PRESTON PRESSURE PS-525 Operation And Maintenance Manual
  1. Manuals
  2. Brands
  3. PRESTON PRESSURE Manuals
  4. Test Equipment
  5. PS-525
  6. Operation and maintenance manual

PRESTON PRESSURE PS-525 Operation And Maintenance Manual

Pitot-static/air data tester
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
To buy, sell, rent or trade-in this product please click on the link below:
https://www.avionteq.com/Preston-Pressure-PS-525A-Air-Data-Pitot-static-Test-Sets-PN-PS-525A.aspx
PS-525
Pitot-Static/Air Data Tester
OPERATION AND MAINTENANCE
MANUAL
For Models PS-525 and PS-525A
prestonpressure.com
Revision 8, November 1, 2013

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the PS-525 and is the answer not in the manual?

Questions and answers

Related Manuals for PRESTON PRESSURE PS-525

Summary of Contents for PRESTON PRESSURE PS-525

  • Page 1 To buy, sell, rent or trade-in this product please click on the link below: https://www.avionteq.com/Preston-Pressure-PS-525A-Air-Data-Pitot-static-Test-Sets-PN-PS-525A.aspx PS-525 Pitot-Static/Air Data Tester OPERATION AND MAINTENANCE MANUAL For Models PS-525 and PS-525A prestonpressure.com Revision 8, November 1, 2013...

  • Page 2: Table Of Contents

    PRESTON PRESSURE LLC PS-525/PS-525A USER AND MAINTENANCE MANUAL TABLE OF CONTENTS Page Warranty and Liability Statement---------------------------------------------------- 2 1. General Information------------------------------------------------------------------- 3 1. Description --------------------------------------------------------------------- 3 2. Pressure Sensors --------------------------------------------------------------- 3 3. Specifications ------------------------------------------------------------------ 4 4. Power Supply ------------------------------------------------------------------ 5 5. Vacuum and Pressure Pumps ------------------------------------------------ 6 6.

  • Page 3: Warranty And Liability Statement

    90 days from the date of purchase. Valves are warranted for a period of 180 days. Preston Pressure’s limit of liability shall be to repair or replace the product at their discretion. Transportation shall be pre-paid to the Preston Pressure factory or authorized service facility.

  • Page 4: General Information

    The tester can simulate pressure and vacuum suitable for up to 35K ft (for the PS-525 models), (50K ft for the PS-525A models) and 650 Knots. The PS-525 measures altitude in feet and meters. Airspeed is displayed in miles-per-hour, kilometers-per-hour, and knots.

  • Page 5: Specifications

    Display Range – model PS-525A: -1000 to 50,000 feet (-305 to 15,240 meters) Vacuum Pump Range – model PS-525: -1000 to 35,000 feet (-305 to 10,700 meters) Vacuum Pump Range – model PS-525A: -1000 to 50,000 feet (-305 to 15,240 meters)

  • Page 6: Power Supply

    The transformer charges the two 12-volt gel-cell lead acid batteries that are internal to the PS-525. The batteries enable the test box to be used in a portable fashion, without a need for external power while the tester is in operation. The test box can be used while charging, if so desired, and may be mounted in any position or angle.

  • Page 7: Vacuum And Pressure Pumps

    Vacuum and Pressure pumps should not be allowed to run continuously. Toggle the switches as needed to re-charge the reservoirs as seen on the vacuum and pressure gauges. OPTIONAL: 110/220 VAC mains powered without internal batteries. In this case, the batteries are replaced by two internal transformers of 12 VDC each.

  • Page 8: Front Panel Layout

    FRONT PANEL LAYOUT...

  • Page 9: Front Panel Description

    Front Panel Description • The front panel’s Altimeter buttons function as follows: The UNITS button is used to toggle between the various units of measurement available from the vacuum/altimeter section. (Altitude – feet, Altitude – meters, mBar, mmHg, inHg, PSIA) The EXIT button is used to exit out of the leak check mode.
  • Page 10 (pin 8), and in the DOWN position the switch will transfer 12 VDC to the encoder connector (pin 8). The position of this switch does not change the voltage going to the PS-525 display circuitry, which always operates at 24 VDC.

  • Page 11: Theory

    CHAPTER 2 THEORY The PS-525 test box consists of two vacuum pumps linked in series, one pressure pump, reservoirs for the pressure and vacuum, a system of metering valves, and digital displays for indicating altitude, airspeed, and various other pressure measurements, based on pressures sensed in the sensor transducers.

  • Page 12: Electronic Theory

    • Electronic Theory The main circuit board of the PS-525 incorporates all the electronics for the altimeter, decoder, and airspeed indicators. The switch on the top of the circuit board allows the operator to select encoder power as being either 12 or 24 Volts DC. Each of the three circuits utilizes its own microcontroller and power supply.

  • Page 13: Electrical Theory

    Various cables may be fabricated to enable the operator to connect any of the current encoders to be tested with the PS-525 test box. Cables are not provided due to the many differing pin-outs in the industry.

  • Page 14: Operation

    OPERATION • Preliminary Information Prior to using the PS-525 tester, the user should become familiar with the unit by reading this manual and operating the tester independently of any other attached devices. For greater accuracy, the tester should be powered on for 15 minutes before use.

  • Page 15: Testing Aircraft Pitot System

    7. The leak check function will activate and begin to monitor the leak rate. Verify that the PS-525 does not leak exceeding 100 feet per minute. Write down the leak rate for future reference. (Subtract this value from the total leak rate when testing the aircraft, to arrive at the aircraft’s leak rate.)

  • Page 16: Testing Aircraft Static System

    Note: If the previous pitot system test indicated an excessive leak, do not proceed until that leak is repaired. Damage to aircraft airspeed indicator could result. 1. Turn on the power to the PS-525. 2. Disconnect the static line to the airspeed indicator, and cap the line.

  • Page 17: Using The E.p.r. Function

    The EPR function is used to test engine pressure ratios. This ratio is the mathematic result of: High Pressure/Low Pressure. The PS-525 test box will display the low pressure, the high pressure (both in PSI), and the resulting EPR. To use the EPR function, proceed as follows: 1.

  • Page 18: Calibration Procedures

    The PS-525 test box is easy to calibrate. There are 4 set points used in the calibration of the altimeter side (7 points for the PS-525A). Calibrating at multiple setpoints enables the altimeter to have a greater degree of accuracy, allowing it to self-correct to the nearest calibrated set point.
  • Page 19 Where XXX is the sensed altitude and YY is the internal correction factor currently stored in the calibration memory. 8. Using the pneumatics of the PS-525 or an attached pressure standard, go to a pressure of 0 feet (referenced from 29.92 inHg), as read from the pressure standard.
  • Page 20 Note: The calibration values are stored in memory as they are being changed, not when exiting from the calibration mode. 13. Bring the PS-525 box back down to ground level pressure, and wait 10 minutes. Then test each calibration point as specified in the chart. Enter the corrected value at each point.
  • Page 21 PS-525 S/N TEST DISPLAY TEST DISPLAY ALTITUDE ALTITUDE ALTITUDE ALTITUDE - 1000 10000 12000 14000 1000 16000 1500 18000 2000 20000 3000 22000 4000 25000 6000 30000 8000 35000 Calibrated by: ___________ Date: ________________ Next Calibration Due Date: ______________________ PS-525A S/N...

  • Page 22: Airspeed Calibration

    Airspeed Calibration Procedures Note: the procedure is identical for both the PS-525 and PS-525A models. 1. Apply power to the PS-525 display and allow unit to warm up for a minimum of 15 minutes. 2. Gently close the Pressure Control valve, Pressure Vent valve, and Crossbleed valve.
  • Page 23 If satisfied with the results, press the Units button to save the calibration and exit back to the mBar mode. Note: Although the display calls out to use 1013.3 for the calibration point, it is not necessary to be at exactly that point. Any point +/- 10.00 mBar from 1013.3 may be used.

  • Page 24: Decoder Reader Calibration

    Calibration Notes: • Do not forget to wait the minimum of 15 minutes before calibrating. • The calibration procedure can be entered only when the mbar mode is selected. • Do not forget to check bead colors in the air pressure reservoir/dryer. If they are pink or clear, it is time to change the unit in order to avoid a build-up of moisture in the pressure system.

  • Page 25: Maintenance Repairs And Troubleshooting

    1. Check color of beads in air reservoir/dryer. Change if pink or clear. The dryer is a common in-line dryer used in small air compressor systems. A new dryer can be purchased from Preston Pressure, or an internet search for “mini inline desiccant air dryer” may lead to an alternate source.
  • Page 26 problem occurs frequently, it may be caused by a loose or dirty internal connector. Check connectors batteries and circuit board. Also check for loose fuses. Display never finishes 1. Tester is being operated 1. Operate the tester in a initializing conditions that warmer environment.
  • Page 27 *See additional battery battery voltage remains low, information below. or charge is rapidly lost, there is a defective battery. Test the voltage level across each battery and replace the battery with the lowest voltage. (Better still, replace both batteries.) 2. Bad fuse(s) 2.
  • Page 28 2. One motor is weak or 2. Replace defective motor inoperative * Additional battery information: The two batteries are connected in series. This enables the unit to have a source of both +12 and +24 volts for the encoder. The +24 volts powers the electronic circuit board and, if selected, the encoder.

  • Page 30: Electrical Schematic

    CHAPTER 6 SHIPPING AND STORAGE Shipping Instructions • Partially open all valves • Ensure power switch is off • Package the test box inside another box, with at least 2 inches of packing material around the tester • Do not forget to also enclose the battery charger/power supply •...

This manual is also suitable for:

Ps-525a

Table of Contents