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The zero function will not operate if the pressure difference is >10hPa.
To zero the PM85, disconnect it from the pressure source, and press
.
3.9 Measurement Mode
It is advisable to zero the PM85 before making measurements (see
section 3.8).
Taking all necessary safety precautions connect the PM85 to the
pressure sources to be measured.
Read the differential pressure from the display.
While in Measurement mode, all measured values are recorded at a
rate of once per second for use by the Hold mode (See section 3.10).
3.10 Hold Mode
The PM85 has the facility to display the maximum reading, the
minimum reading, the difference between maximum and minimum
readings and the average of the recorded readings.
MODE
To enter the Hold mode press
The LCD will display HOLD and the last measured value will be held
on the display.
MODE
Successive presses of the
button will display the following in
sequence:
HOLD MAX - maximum recorded reading;
HOLD MIN - minimum recorded reading;
HOLD MAX-MIN - difference between max and min recorded
readings;
HOLD AVG - average of the recorded readings (Only for air speed
measurement).
4. MAINTENANCE
4.1 Battery Replacement
The battery compartment is on the rear of the unit.
Push the battery cover up towards the inlet ports and lift away from
the back of the unit.
Replace with 2 new AAA batteries (IEC LR03, NEDA 24A), observing
correct polarity.
Replace the battery cover.
Note: Do not mix old and new batteries.
4.2 Calibration
To maintain the integrity of measurements made using your
instrument, Martindale Electric recommends that it is returned at least
once a year to an approved Calibration Laboratory for recalibration
and certifi cation.
Martindale Electric is pleased to offer you this service. Please contact
our Service Department for details.
Email: service@martindale-electric.co.uk
Tel: 01923 650660
4.3 Cleaning
If contamination is found, clean with a damp soft cloth and if
necessary a mild detergent. Do not use abrasives, abrasive solvents,
or detergents which can cause damage to the unit. If a mild detergent
is used, the unit should subsequently be thoroughly cleaned with a
water dampened soft cloth. After cleaning, dry and allow to remain in
a dry environment for 2 hours before use.
while in Measurement mode.
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The unit will return to the Measurement mode at the end of the
above sequence.
To clear the recorded readings, press
at any point in the above sequence. The unit will return to the
Measurement mode.
Note: The Hold mode will not function until at least 3 measurements
have been stored to memory.
7
8
PM85 instructions rev1.indd 7
4.4 Repair & Service
There are no user serviceable parts in this unit other than those that
may be described in section 4. Return to Martindale Electric if faulty.
Our service department will quote promptly to repair any fault that
occurs outside the guarantee period.
Before the unit is returned, please ensure that you have checked the
unit and batteries.
4.5 Storage Conditions
The instrument should be kept in warm dry conditions away from
direct sources of heat or sunlight, and in such a manner as to
preserve the working life of the unit. It is strongly advised that the
unit is not kept in a tool box where other tools may damage it.
9
10
MODE
for 2 seconds
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