Abtus ABT 4550 Series User manual

ABT 4550 Prism Track Gauge
Instruction Manual

1.0Index
1.0 Index ..................................................................................................... 2
2.0 Overview................................................................................................ 3
3.0 Technical Specification............................................................................ 4
4.0 Functionality........................................................................................... 4
4.1 Track Gauge....................................................................................... 4
4.2 Cant...................................................................................................5
5.0 Maintenance........................................................................................... 5
5.1 User Advice ........................................................................................ 5
5.2 Every 3 Months...................................................................................6
5.3 Annual................................................................................................ 6
5.4 Replacing the PP3 Batteries.................................................................6

2.0Overview
Abtus track gauges have been designed with a sprung gauging foot, with all measurements
displayed on the useable end of the gauge, ensuring improved repeatability and accuracy of
measurements, whilst minimising potential for user error.
Constructed from hard-wearing glass reinforced plastic (GRP) and polyvinyl chloride (PVC),
the ABT4550 is electrically non-conductive and will not interfere with the track signalling circuit.
These therefore are suitable for use in areas of 3rd and 4th rail electrification. The ABT4550
is available in both imperial and metric versions for multiple track widths. The standard
mushrooms measure 14mm below the top of the rail (TOR), alternative P-points should be
specified when an order is placed.
Super-Elevation is measured electronically and is shown on an LCD display. The expected
battery-life for normal, average usage is 12 months. The unit is powered by 2 standard 9v PP3
battery which can be easily by replaced by the operator when required.
Track Gauge is measured mechanically with readings displayed through a clear polycarbonate
window on a linear scale.

3.0Technical Specification
Table 1-Technical Specification table
Expected battery life 12 months
Adapter M8 male thread to 12mm Leica spigot Length –40mm
4.0Functionality
4.1 Track Gauge
Track gauge or rail gauge is the distance between the inner sides of the heads of the two stock
rails, as shown in Figure 1.
Weight
-
3.2Kg
Size
-
1660mm x 135mm x
150mm
Cant
-
Range: ± 199mm
Accuracy: ± 1mm
Resolution: 0.1mm
Gauge
-
Range: 1410 –
1490mm
Accuracy: ± 1mm
Resolution: 1mm
*Dependent upon Gauge Type & Gauge Size
Gauges manufactured in compliance with NR/L3/TRK/4900 Track Gauge Specification
Figure 1 - Track Gauge/ Rail Gauge

Once the gauge has been positioned in the track, the Track Gauge reading can be read from
the window indicated in Figure 2.
4.2 Cant
To measure Cant, press the button located on the side of the gauge, a measurement will
appear on the screen above. Wait for a few seconds before taking a reading to ensure that the
gauge is settled. The display will turn off within a minute of pressing the button.
5.0Maintenance
5.1 User Advice
The ABT 4550 series gauges are a piece of precision measurement equipment. Whilst it has
been designed for use in an engineering environment due care should be taken not to cause
damage to the equipment when in operation, storage or transit. Excessive trauma to the
moving parts of the gauge may invalidate the calibration and lead to possible measurement
inaccuracies.
Figure 2 - Track Gauge Reading

5.2 Every 3 Months
Visually inspect the ABT 4550 series gauges for signs of damage. If necessary, contact your
local distributor for help.
5.3 Annual
The ABT 4550 series gauges must be returned annually for re-calibration to ensure
measurements are within specification.
The condition of all components will be checked at this time and replaced as required.
5.4 Replacing the PP3 Batteries
To replace the PP3 batteries, carefully remove the battery compartment from the front of the
gauge as shown in Figure 7. Visually inspect the gasket for signs of wear/damage and replace
if necessary, contact your local distributor for help.
Figure 3 - Battery Replacement