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3.9 Measurement Mode
The DH85 has 7 moisture content ranges:
Wood 1 - Hard wood
Wood 2 - Soft wood
Mortar 3 - Plaster
Mortar 4 - Anhydrite screed
Mortar 5 - Cement mortar
Mortar 6 - Lime mortar
Mortar 7 - Bricks
Press
for < 1 second until the required measurement range for
the material to be tested is selected.
Lightly press the DH85 test probes into the surface of the material
under test.
The moisture content is displayed on the upper section of the LCD.
The dry bulb temperature is displayed in the lower right section of
the LCD.
The lower left section of the LCD displays relative humidity, dew point
temperature or wet bulb temperature as required.
Press
for > 2 seconds to scroll through the following
measurements on the lower left section of the LCD:
relative humidity - the LCD will display %;
dew point temperature - the LCD will display td;
wet bulb temperature - the LCD will display WB.
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).
To achieve accurate measurements, it is advisable to allow the DH85
suffi cient time to reach temperature and humidity equilibrium with the
environment of the material under test.
The following factors can effect temperature measurement –
exposure to sunshine during measurement, heating systems, cold
external walls, movement of air (e.g. fans), hands or body heat and
insuffi cient stabilisation or measurement time.
The following factors can effect humidity measurement – exposure to
steam, water or condensation on the sensor.
4. MAINTENANCE
4.1 Battery Replacement
Push the battery cover up towards the probes and lift away from the
back of the DH85.
Remove the old batteries from the battery compartment.
Replace with 2 x new AAA batteries (IEC LR03, NEDA 24A),
observing correct polarity as indicated on the base of the battery
compartment.
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.
3.10 Hold Mode
The DH85 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 (Humidity and
temperature measurements only).
To enter the Hold mode press
The LCD will display HOLD and the last measured values will be
held on the display.
Successive presses of the
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.
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.
3.11 Measurement Considerations
The moisture content in the material may vary, so it is advisable to
take measurements at more than one point.
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DH85 instructions rev1.indd 7
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.
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 provide a quotation 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
while in Measurement mode.
MODE
button will display the following in
MODE
for 2 seconds
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