User Guide

DigiTemp Digital Thermometer - Intrinsically Safe Version
Instruction Manual
Page 1
The Rototherm DigiTemp (Intrinsically Safe Version) is a battery-powered digital thermometer designed to suit a wide range of
industrial applications in hazardous process areas where potentially explosive atmospheres may be present. The DigiTemp is
housed in a robust stainless steel case, sealed to IP67 rating, which is suitable for hostile environments without additional
protection.
Before installation
Before installing this thermometer, please read these instructions completely. Failure to do so could result in permanent damage
to the unit. Particular attention should be given to the following points:-
Hazardous area compatibility :
By reference to the intrinsic safety marking code of the DigiTemp (Eex ia IIC T4, marked on the dial and also stated on the certifi-
cate) ensure that the gauge is suitable for use in the environment of the hazardous zone.
Installation
Installation should be undertaken only by qualified personnel familiar with safety practices and standards relating to intrinsically
safe electrical apparatus.
Location and mounting :
Thermometers fitted with a rigid stem of 6.35 or 12.7mm diameter are intended to be supported by means of a fixed or sliding
gland. Do not overtighten the gland nut. Instruments which are fitted with flexible or semi-rigid minerally-insulated stems are gen-
erally supplied with a three-hole mounting flange which allows the thermometer to be either surface or panel-mounted. The fixing
centres of the flanges are indicated in Figure 1 below.
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Figure 1 - Mounting details for panel (front flange) and surface (back flange) versions.
Immersion length :
For accurate temperature measurement it is essential that the sensitive portion of the stem (generally the section 19mm from the
tip of the stem) is fully immersed in the medium to be measured. It is recommended that the immersion length should be at least
three times the length of the sensitive portion of the stem.
Process conditions and thermowells :
Ensure that the stem material of the DigiTemp (generally stainless steel, 316 grade) is compatible with any chemically aggressive
medium that it may come into contact with. If the process medium is under pressure (3.5bar or greater), for safety reasons the
stem of the DigiTemp should be protected by a thermowell ('pocket') designed to suit the process conditions. A wide range of
thermowells are available from British Rototherm; please contact the Sales Office for advice.