User manual ROTOTHERM DIGITEMP DIGITAL THERMOMETER (IS VERSION)

[. . . ] A wide range of thermowells are available from British Rototherm; please contact the Sales Office for advice. DigiTemp Digital Thermometer - Intrinsically Safe Version Instruction Manual R Page 2 Variants The DigiTemp is available in several variants using either a thermocouple or a platinum RTD probe, and offering several temperature ranges. In addition, the instrument is available with display units of degrees Celsius or degrees Fahrenheit. Cleaning To remove the risk of discharges due to static electricity, cleaning should only be undertaken using a damp cloth. Strong solvents should not be used to clean the window. Battery replacement When the battery is nearing the end of its life the 'LOW BATTERY' warning light above the display will begin to flash. At this point the battery has less than six months' life remaining and is due for replacement. WARNING: Tools : For continued protection it is essential that only a battery pack of the same type is fitted. [. . . ] Unsolder the battery leads at the appropriate points. Replace the battery by soldering the leads of the new pack to the appropriate points. Take care to make a neat joint with a minimum of bare wire. Trim any surplus wire projecting from the soldered-side of the circuit board. Complete the operation by reversing the actions taken in 1 to 5 above. Take care not to overtighten any of the fasteners involved. For safety reasons the temporary link across the fuse must be removed. When refitting the bezel make sure that the sealing gasket is between the window and the case. Tighten the bezel with firm hand pressure. 2. 3. 4. 5. 6. 7. 8. DigiTemp Digital Thermometer - Intrinsically Safe Version Instruction Manual R Page 3 Dial securing screws Fuse Retaining plate Retaining plate nuts Battery pack LOW Battery leads BATTERY E + Made in U. K. Circuit board assembly securing screws Bonding strap Sensor leads Figure 2 - Battery replacement (showing various stages) 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. 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. For all instruments there are two trimmers marked 'ZERO' and 'SPAN' on the circuit board. 2. 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. [. . . ] Various, as requested to order (including 6. 35mm, 12. 7mm and flexible MI). T/C: ±1°C ±1 digit typically, RTD: ±0. 2°C ±1 digit. T/C: Zero: ±0. 05°C/°C ambient change Span: ±0. 01%FS/°C ambient change RTD: Zero: ±0. 005°C/°C ambient change Span: ±0. 003%FS/°C ambient change (Figures for T/C version include CJ compensation). 4 digit liquid crystal with 12. 7mm high characters. [. . . ]