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.
CONTENTS Page Introduction 2 Description of Operation of Gas Pressure Recorder 2 Description of Operation of Temperature Recorder 2 Description of Operation of Differential Pressure Recorder 2 Receipt of Recorder 3 Receipt of Temperature Recorder 3 Installation and Mounting - wall or panel mounting 3 Installation and Mounting - 2” pipe or post mounting 4 Installation and Mounting - Differential Pressure Recorder complete with 2” pipe or post mounting 5 Process Connections - Pressure 6
Clearscan™ Recorder Series - Operating and Service Manual INTRODUCTION The Clearscan™ Series of circular chart recorders is designed to measure and record process variables such as temperature, pressure and flow. A maximum of three measuring systems can be provided in each instrument, a fluid or gas expansion system is used for temperature recording, a bourdon tube or diaphragm/capsule for pressure measurement and a differential pressure cell for flow reading.
RECEIPT OF RECORDER The Clearscan recorder complete with a packet of charts, door keys and pen pack(s) is dispatched in a protective casing which should preferably be replaced after inspection, as protection until the instrument is ready for installation. The spare pen pack(s) and door keys are inside the protective case. To assist with inspection, a label attached on the inside face of the case door states instrument serial number, chart number, range of each pen and the rotation speed of the chart drive.
Clearscan™ Recorder Series - Operating and Service Manual INSTALLATION AND MOUNTING - 2” pipe or post mounting Ideally the site chosen should be free from dust, corrosive fumes, vibration and extremes of temperature. The instrument is suitably designed for outdoor weather conditions and protected against ingress of dust and water. The recorder is suitable for mounting onto a 60mm outside diameter post or pipe having a 2" nominal bore using the 'U' bolts provided.
INSTALLATION AND MOUNTING - Differential Pressure Recorder complete with 2” pipe/post or wall mounting 315 371 41 114 60mm O/D PIPE OR POST 103 1/4"NPT FEMALE PORTS HIGH +VE PRESSURE LOW -VE PRESSURE 65 490 420 1/4"NPT FEMALE PORTS 54 DIFFERENTIAL PRESSURE CELL CASE BREATHER STATIC PRESSURE CONNECTION 1/2" NPT STANDARD 53 56 216 302 Fig. 1c Outline Dimensions for 12 inch chart recorder (fitted with Differential Pressure Unit) all dimensions are in mm 60mm O.D.
Clearscan™ Recorder Series - Operating and Service Manual PROCESS CONNECTIONS - Pressure To avoid confusion on instruments fitted with more than one measuring system, the connections are marked with the same colour as the corresponding recording pen colour. The recorder is fitted with NPT threaded connection(s) and all pipelines attached to it must be secure and leak proof. PTFE sealing tape must be used to make a pressure tight join to the recorder connections.
PROCESS CONNECTIONS - Differential Pressure Recorder The ¼-inch-18 NPT piping connections of the differential pressure unit when viewed from the rear of the recorder are as follows: High pressure on the right hand side marked + Low pressure on the left hand side marked The following practices should be followed on all flow and liquid level DPU piping. 1. The distance between the primary device and the DPU should be as short as possible. Distances exceeding 100 feet are not recommended.
Clearscan™ Recorder Series - Operating and Service Manual INTERNAL FEATURES Blue Fig. 2 Internal Features (with chart plate in place) RECORDER START-UP CHECK Before putting the recorder into operation make the following checks to ascertain that it is correctly installed and operational. 1. Remove the elastic band securing the pens to the steel pen lifter arm for despatch purposes. 2. The pen(s) operate freely, write clearly on the chart and pass each other without touching. 3.
DPU RECORDER INITIAL START-UP Due to possible periods of storage prior to installation, the DPU bellows may take a "set". Therefore, it is recommended that the first time the DPU is used, and prior to actual operation, the instrument be exercised to ensure correct operation. To exercise the DPU, apply maximum and minimum pressure to the high pressure side for at least ten cycles. DPU RECORDER GENERAL PRACTICES Observe the following practices when starting operation of the instrument: 1.
Clearscan™ Recorder Series - Operating and Service Manual REPLACEMENT OF INK PENS Ink capsules can be easily replaced when the ink is exhausted. To fit a new pen capsule: 1. Operate the pen lifter by hand by removing it from under the catch post attached to the case wall on the inner left-hand side. This will raise all pens away from the chart paper. 2. Un-clip the moulded clamp on the pen capsule; remove the existing capsule by pulling carefully upwards and outwards from pen arm. 3.
TRACKING ADJUSTMENT TO CHART TIME LINE To adjust the pen arm arc length to accurately track the chart time line, gently slacken the two pen arm clamp screws shown in Fig. 4 and increase or decrease the pen length by sliding the metal pen arm in or out until the pen records along the chart time line across the whole of the chart scale length. Re-tighten the two clamp screws. Note the red pen only must track the chart time line, other pens fitted must be set to clear each and one another.
Clearscan™ 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.
BASIC FAULT FINDING Recorder pen inaccurate or gives no indication Probable cause Action Measuring element broken, pressure line plugged or broken. Check element / pressure line; replace system if necessary. Probable cause Action Damaged linkage in recorder. Repair and re-connect if possible; replace if necessary. Probable cause Action Recorder out of calibration; measuring element damaged. Set-up and recalibrate; replace system if necessary.
Clearscan™ 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.
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.
Clearscan™ 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.
RANGE ADJUST RATIO POST BENEATH PEN ARM HORIZONTAL ADJUSTABLE LINK DRIVE ARM DRIVE ARM ADJUST SCREW TORQUE TUBE CLAMP SCREW PEN STOP FLANGED BEARING CALIBRATION CHART SHAPE BALANCE WEIGHT 0% INDICATION CHART TIME LINE 50% INDICATION 100% INDICATION Fig.
Clearscan™ 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.
PRESSURE PEN CALIBRATION for pressure ranges 2.5 bar to 40 bar Mechanical calibration is concerned with the accurate setting of zero, span and linearity of the recording pen. The adjustments detailed below must be performed in the order listed. Unless a replacement mechanism assembly, bourdon or mechanical linkage is to be fitted it should not be necessary to make coarse or linearity adjustments.
Clearscan™ Recorder Series - Operating and Service Manual leaks. Release pressure. 7. Apply 50% full rated pressure of the bourdon and set the coil lever to be absolutely vertical by loosening the coil lever clamp screw and moving the coil lever appropriately. Re-tighten the clamp screw. 8. Adjust the length of the horizontal link if necessary to make the pen read on the mid scale line of the chart at 50% full rated pressure. Re-tighten the linkage screws. 9.
MAINTENANCE AND CALIBRATION - DIFFERENTIAL PRESSURE RECORDER CALIBRATION CHECK A. Differential Pressure Pen Normally, all that is required to adjust the instrument calibration to factory settings is to perform the following procedure: 1. Verify that the instrument is positioned level and is securely mounted. 2. Connect the high pressure housing into the set-up shown in figure 6. 3. Vent the DPU low pressure side to atmosphere by removing one vent plug from the low pressure housing. 4.
Clearscan™ Recorder Series - Operating and Service Manual 8. Remove the chart, chart plate and pen stop. 9. Mount a calibration chart onto the chart drive hub and lock in place. The calibration chart should be prepared by cutting a chart into shape shown in figure 3d and gluing it to a stiffener of similar shape. This special chart will allow calibration of the pens while permitting access to the recorder linkages when adjustments are necessary. CAUTION: VERIFY THAT ALL LINKAGE IS FREE.
SPARES LIST Note: for replacement measuring systems the instrument serial number must be supplied and in the case of instruments which have more than one measuring system, the position of the system. Measuring system Quote instrument serial number Chart Quote range(s) and rotation(s).
