Delta PG-40 Specifications download pdf (Page 16)

16 LTL-X Retrometer DELTA

Notes on error sources

Stray light can occasionally enter the instrument but will be insignificant under normal meas-

urement conditions. Before each measurement, the LTL-X automatically evaluates the leak-

age and compensates for it before the readout. In case of a significant leakage level, a warning

or error message is given and special precautions may be necessary.

Instrument leak, drift and offset errors are compensated by means of data obtained during the

calibration procedure. It is very important to keep the light trap, the dust-protection window

and the ceramic on the calibration unit clean.

The LTL-X illumination angle is 1.24° relative to the road surface. Because of this small an-

gle accurate placement on the road is important. Avoid pebbles and abnormal irregularities.

The LTL-X must be parallel and in contact with the marking surface.

The LTL-X retrometer is a rugged instrument, but it is an optical instrument and must be han-

dled as such.

The LTL-X is factory calibrated. Nevertheless start measurements with a calibration. Study

the display for any warning or error icons. See also Section 4 - Maintenance

Note

High temperature conditions.

Display

If the display is exposed to intense direct sunlight during a longer period of time the display

could become overheated.

To reduce heat an IR-reflecting filter is mounted on the display. It is recommended to close

the protective display shield. The shield also protects against damages and scratches.

"Daylight readable" displays are vulnerable to high temperatures. High temperature will de-

crease the display service life.

When the display temperature exceeds 50C / 122F an audible alarm will sound. The alarm

will sound for 20 second and then pauses for one minute. This sequence continues until the

temperature is lowered or the instrument is turned off. The alarm can be suspended for one

minute by pressing any key.

Battery

The battery is rated to maximum 45C / 113F operating temperature.

Keep the light trap, dust-protection window and ceramics

on the calibration unit clean.

Keep the battery fully charged. A well charged battery is

more resistant to aging and damage.

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Delta PG-40 Specifications Page 16