Operation; Preliminary Information; Error Codes; Pre-Testing - PRESTON PRESSURE PS-500 User And Maintenance Manual

 Preliminary Information
Prior to using the PS-500 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 10 minutes before use.
The test procedures described in this manual are general in nature, for reference
use only. The operator may substitute these procedures with others, as applicable to the
tests to be performed, or according to other specific documentation.
Error codes display as follows:
 The display will indicate "Too Cold" or "Too Hot" if the sensor temperature is below
32F or 0C, or above 122F or 50C. Beyond these limits the accuracy should not be
trusted.
 Altitude displays "Too High" if it exceeds 35,500 feet.
 "Inverse Pressure" will be indicated on the airspeed side if the static pressure exceeds
the pitot pressure by more than approximately 0.1 mbar. Due to its independent
pressure and static sensors, no damage will occur to the tester due to inverse pressure.
However, damage could occur to any system attached to the tester, therefore the
warning is to alert the user of the condition.
 "Max Speed" will be indicated on the airspeed side if the pressure exceeds the
equivalent of 650 knots. Due to independent pressure and static sensors, no damage
will occur to the tester from this condition. However, damage could occur to any
system attached to the tester, therefore the warning is to alert the user of the
condition.
 "Low Battery" will blink on displays if the battery voltage is less than approximately
9 volts.
 Pre-Testing
Pre-test the static system of the PS-500 test box according to the following steps:
1. Ensure the PS-500 is not connected to any external hoses or devices.
2. Close the Vacuum Control, Vacuum Vent, Pressure Control, and Pressure Vent
valves. Open the Crossbleed valve.
3. Turn on the power, and then turn on the Vacuum Pump switch until the Vacuum
Reservoir gauge reads -15 inHG or greater vacuum.
CHAPTER 3

OPERATION

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