User manual ROTOTHERM DIGITEMP DIGITAL THERMOMETER

[. . . ] 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. Instruments which are fitted with flexible or semi-rigid minerally-insulated stems are generally supplied with a three-hole mounting flange which allows the thermometer to be either surface or panel-mounted. [. . . ] 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. Procedure Calibration of the DigiTemp thermometer is achieved by adjusting two multi-turn trimmer potentiometers which are located behind the dial. One trimmer (P1) provides adjustment of the zero reading, a second (P2) controls the span. An ice bath reference should be used when setting the zero trimmer to give a reading of 0°C (32°F) and the span adjustments may be made by comparing the readings of the DigiTemp with those of an accurate reference standard thermometer at a higher temperature. (For best accuracy the higher temperature should be close to the upper measurement limit. ) If a standard thermometer and high temperature bath are not available the DigiTemp may be checked by immersing the stem in boiling water (100°C, 212°F). Fully immerse the stem in a bath containing a mixture of clean crushed ice and water. Allow time for the stem to settle at the temperature of the ice bath, stir the bath occasionally. Adjust the zero trimmer potentiometer if necessary until a reading of 0. 0°C is obtained (32. 0°F for the °F version). Allow sufficient time for the stem temperature to reach that of the bath, then adjust the span trimmer potentiometer (P2) until the display reading matches the reference. Return the DigiTemp stem to the ice bath and check that the 0°C reading has not altered. It may be necessary to repeat the above zero and span adjustments several times until both readings are satisfactory. 2. 3. DigiTemp Digital Thermometer Instruction Manual R Page 3 Calibration (continued) 4. [. . . ] Display will alternate between temperature reading and BATT BS EN 50081-1 : 1992 BS EN 50082-2 : 1995 100mm dia. IP67 Details given in this instruction sheet are subject to change without notice. JAG 10/2003 ISO 9001 Certificate No. [. . . ]