User manual ROTOTHERM CLEARSCAN RECORDER

[. . . ] user manual installation, setup, operation & calibration With over sixty years of experience, British Rototherm continues to be a world leader in the manufacture of industrial instrumentation for measuring, monitoring and controlling Temperature, Pressure, Humidity, Flow and Level. British Rototherm products are manufactured in its modern factory located in the South Wales region of the United Kingdom. Sited on 6 acres of land at Kenfig Industrial Estate, the company operates from a modern 6, 030 square metre (65, 000 square feet) factory. Suitable for many industrial applications, Rototherm products are precision built to the highest quality. [. . . ] To replace, plug the housings together and push until fitted correctly, the housings can be fitted one way only. LINKAGE AND PIVOT ATTACHMENTS The instrument employs similar linkage attachment whether the measuring system is temperature, pressure or differential pressure. The diagram and glossary below is provided to supplement the figures presented throughout this manual to show the terminology and correct arrangement to ensure friction free linkage movement and therefore accurate pen traces. 11 ClearscanTM Recorder Series - Operating and Service Manual Fig. 4 Linkage and Pivot Attachments The recording pen mechanism assembly, mounted to the base plate via a bracket, provides attachment to the measuring elements. Each measuring element provides output movement via an adjustable take-off assembly arm or direct drive arm. Either type is terminated in a tapped hole to which is attached the adjustable horizontal link via a shoulder screw forming a pivot without excess side movement for smooth friction free movement. The adjustable horizontal link is screwed into the ratio post at its opposite end providing a smooth pivot without excessive free movement or play thereby eliminating hysteresis. The ratio post provides an adjustable point of pivot for the adjustable horizontal link and span adjustment is thereby provided by the position of the ratio post which is fitted through the slot in the pen bracket and clamped by a ratio post washer and locknut in terms of its pivot distance to the pen bracket spindle. To replace a pen mechanism assembly, remove the shoulder screw(s) from the ratio post(s) and undo the two nuts securing the pen mechanism bracket to the mounting bracket. Retain all fixings ensuring the relative shoulder screw is mated with its original linkage. Mount a new mechanism in reverse order and measure the ratio post(s) distance from the spindle. Adjust the ratio post(s) to this dimension before carrying out the appropriate calibration procedure. 12 BASIC FAULT FINDING Recorder pen inaccurate or gives no indication Probable cause Action Probable cause Action Probable cause Action Measuring element broken, pressure line plugged or broken. Set-up and recalibrate; replace system if necessary. No record or poor trace on chart Probable cause Action Probable cause Action Chart not rotating Probable cause Action Probable cause Action Clock unwound. Adjust pen friction. After carrying out the basic fault finding if the problem is still evident, refer to the detailed maintenance procedures or contact British Rototherm or your local authorised British Rototherm distributor for spares, information and technical advice and support. 13 ClearscanTM Recorder Series - Operating and Service Manual TEMPERATURE BOURDON COARSE ZERO ADJUSTMENT SCREW COMPENSATOR ARM RATIO POST (UNDERNEATH PEN ARM) LINEARITY LINK CATCH POST PENLIFTER CHART DRIVE CHART PLATE (PARTIALLY REMOVED) CAPILLARY OUTLET PLATE CAPILLARY TUBING SENSING BULB Fig. 5a Temperature Recorder Internal Layout 14 COARSE ZERO ADJUST SCREW BOURDON TUBE TAKE OFF ASSEMBLY ZERO ADJUST SCREW LINEARITY LINK CATCH POST PENLIFTER CHART DRIVE CHART PLATE (PARTIALLY REMOVED) CAPILLARY OUTLET PLATE PRESSURE CONNECTION Fig. 5b Pressure Recorder Internal Layout (ranges up to 40 bar) 15 ClearscanTM Recorder Series - Operating and Service Manual ADJUSTABLE HORIZONTAL LINK DRIVE ARM CATCH POST COIL LEVER SCREW COARSE ZERO ADJUST BOURDON TUBE PENLIFTER CHART DRIVE CHART PLATE (PARTIALLY REMOVED) CAPILLARY OUTLET PLATE PRESSURE CONNECTION Fig. 5c Pressure Recorder Internal Layout (ranges 60 bar and above) 16 RANGE ADJUST RATIO POST BENEATH PEN ARM HORIZONTAL ADJUSTABLE LINK DRIVE ARM DRIVE ARM ADJUST SCREW PEN STOP TORQUE TUBE CLAMP SCREW FLANGED BEARING CALIBRATION CHART SHAPE BALANCE WEIGHT 0% INDICATION CHART TIME LINE 50% INDICATION 100% INDICATION CHART DRIVE HUB SHOWN LOCKED Fig. 5d Differential Pressure Recorder Internal Layout 17 ClearscanTM Recorder Series - Operating and Service Manual TEMPERATURE PEN CALIBRATION Mechanical calibration is concerned with the accurate setting of zero, span and linearity of the recording pen in comparison with a known temperature read with a certified thermometer traceable to national calibration standards. The adjustments detailed below must be performed in the order listed and the instrument must be allowed to settle before readings and adjustments are made. Unless a replacement mechanism assembly, temperature system or mechanical linkage is to be fitted it should not be necessary to make coarse or linearity adjustments. If it is not possible to achieve one or more of the following settings, contact your nearest Rototherm Distributor or the company itself. Allow the recorder to stabilise with the measuring element in a low temperature just above scale minimum. The temperature recording pen should read within ±1% of full span at the correct temperature value. [. . . ] SET THE RANGE ADJUST, PEN ZERO AND LINEARITY ADJUST SCREWS TO THEIR MIDPOINT. Apply 50% differential pressure to the high pressure side and arrange the differential pressure linkage as shown in figure 3d. Set a 90° angle between the drive arm and horizontal link, then by adjusting the length of the link, set a 90° angle between the pen arm and horizontal link. Set the differential pressure pen to 50% indicating position on chart by adjusting zero adjust screw. [. . . ]