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Fault Finding Guide

Problems relating to the Transmitter

Symptoms Cause Action

The detector outputs Beam-block. The HHT

receives data only a few times a minute. The

Transmitter is not ﬂashing

The Transmitter is not powered Check power supply and cabling

The Transmitter has an internal fault Remove the Transmitter head and gimbal

assembly from its mounting, replace it with a

spare conﬁgured to the same Channel, and

return it to the factory. Changing the Transmit-

ter will not affect the calibration of the detec-

tor, but it must be realigned and re-zeroed in

the normal way

The detector outputs Beam-block. The HHT

receives data only a few times a minute. The

Transmitter is ﬂashing and there is no obstruc-

tion in the path but the Receiver is blind to the

ﬂashes

The Transmitter and Receiver are conﬁgured

to different Channels

Reconﬁgure the Transmitter and/or the

Receiver so that their Channels are the same

The detector output is at Pre warning. The

HHT indicates a Transmitter Fault

The Transmitter is in Fault Mode because an

internal test has indicated that one or more of

the ﬂash tubes failed to trigger. The test is

made more stringent than normal operation by

attempting to trigger the tube at a reduced volt-

age. A complete cycle of tests is completed a

few times per hour if the ﬂash rate is once per

second

It is not essential to replace the Transmitter

urgently, because the detector remains opera-

tional and its performance is not signiﬁcantly

impaired. The Pre warning may clear of its own

accord. If it persists then the Transmitter

should be replaced at the next convenient

opportunity. Remove the Transmitter head and

gimbal assembly from its mounting, replace it

with a spare conﬁgured to the same Channel,

and return it to the factory. Changing the

Transmitter will not affect the calibration of the

detector, but it must be realigned and re-

zeroed in the normal way

When the detector is switched to Alignment

Mode the Transmitter ﬂash rate fails to change

to four per second, but remains at once per

second

The link is not connected between the

Receiver and the Transmitter

Connect the HHT to the Transmitter. The

cause is conﬁrmed if the HHT receives no

data. Check the cabling and connections

The Transmitter is in Fault Mode which pre-

vents the detector being aligned and zeroed.

Fault Mode is designed to allow the detector

to continue working until it is convenient to

gain access to it. However it is not recom-

mended to reinstall a Transmitter already in

Fault Mode

Conﬁrm that the HHT indicates Transmitter

Fault. Further action as shown above for this

Pre warning

When the detector is switched to Alignment

Mode the Transmitter ﬂash rate fails to change

to four per second, but instead changes to two

per second. The HHT does not show any align-

ment data

An internal test in the Transmitter has detected

that the supply voltage is too low. The test is

more stringent than an external voltmeter test

because it is made with the heater switched on

and at the peak of the charging cycle

Check the supply voltage at its source and that

the cable run does not exceed the maximum

speciﬁed for the core size used

We have installed several detectors at similar

distances. One shows a lower signal strength

than the others. Its alignment readings also

seem to wander

A difference of six on the HHT's signal

strength scale (in dB units) corresponds to a

halving of the signal strength. Variations of a

few dB between units are normal. Larger varia-

tions could indicate that a Transmitter or

Receiver has been aligned onto a false peak.

For instance, the Receiver may see the Trans-

mitter both directly and as a reﬂection in a

shiny surface close to the beam path

Realign and rezero the detector, taking care to

ﬁnd the strong central peak. In some circum-

stances a strong reﬂection could cause false

misalignment warnings and need to be

screened or covered

The mountings of the Transmitter and/or

Receiver are not sufﬁciently rigid

Provide additional bracing for the mountings.

Notice that their rigidity is more important than

their strength, changes in direction more

important than translational movements

Brand	Dräger
Model	Polytron Pulsar 2
Category	Security Sensors
Language	English

Dräger Polytron Pulsar 2 User Manual

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