User Guide
L
OW
BATTERY
Made in U.K.
E
+
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Dial securin
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screw
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Circuit board assembl
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securin
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screws
Batter
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lead
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Retainin
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plat
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nu
t
s
R
etainin
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plat
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Bondin
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stra
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F
use
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ac
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Batter
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Se
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so
r l
eads
Figure 2 - Battery replacement (showing various stages
)
DigiTemp Digital Thermometer - Intrinsically Safe Version
Instruction Manual
Page 3
R
Calibration
Each DigiTemp thermometer is fully calibrated during manufacture and certificates of calibration may be requested at time of
ordering. It is recommended that the calibration of the thermometer should be checked against a known temperature standard
every 12 months or at intervals specified by relevant quality assurance procedures. British Rototherm offers a rapid in-house
recalibration service for its temperature measurement products, traceable to national standards. Please contact the Sales Office
for details.
WARNING: Calibration must only be undertaken with the DigiTemp removed from the hazardous area.
Tools : The following tools will be required for calibration -
Flat-bladed screwdriver approx. 6mm wide,
Flat-bladed screwdriver approx. 3mm wide.
Procedure : (See Figures 2 & 3.)
1. Remove the bezel by unscrewing it from the case, anticlockwise. The window and its sealing ring may come off with the
bezel but must in any case be removed.
2. Unscrew the two screws securing the dial (at the 9 o'clock and 3 o'clock positions) and remove the dial.
In the case of a DigiTemp variant fitted with a platinum RTD probe the calibration trimmers will be found in the 4 o'clock
position. For the thermocouple variant the trimmers will be found in the 8 o'clock position. See Figure 3. For all
instruments there are two trimmers marked 'ZERO' and 'SPAN' on the circuit board.
In the case of a DigiTemp variant fitted with a platinum RTD probe the calibration trimmers will be found in the 4 o'clock position.
For the thermocouple variant the trimmers will be found in the 8 o'clock position. See Figure 3. For all instruments there are two
trimmers marked 'ZERO' and 'SPAN' on the circuit board.