C105 Circular Case Recorder Operating Instructions Fig. 1. CONTENTS Page No. INTRODUCTION Identification Specification INSTALLATION Mounting Access to Recorder Process Connections Electrical Connections OPERATION Mechanical Clock Fitting a Chart Set Pointer Adjustment Inking System Zero Adjustment Start-up Check Start-up Procedure Description of Operation Electrical alarm/control system Programme Control 2 2 3 4 4 5 5 5 6 6 6 6 6 7 7 7 8 10 10 MAINTENANCE Cutting a programme cam Pen Adjustment Calibration Servicing Wet and Dry Bulb Water Bath SPECIAL INSTRUCTIONS & DIAGRAMS FAULT FINDING SPARES LIST Page No. 11 11 11 11 12 13 14 15 15 & 16 The chart drive and control system on this instrument may be operated from a mains voltage supply. The mains must be switched off before making any mechanical adjustments other than of the set pointers or carrying out any maintenance or fault finding procedures. When making electrical adjustments observe the warning notes in the text. instrumentation and control INTRODUCTION The C105 series of instruments is designed to measure, record and control process variables such as temperature, pressure and humidity. A maximum of two measuring systems is provided in each instrument; a fluid expansion type or bimetallic system is used for temperature recording, a hygroscopic element or a wet and dry bulb system for humidity and a Bourdon tube or diaphragm for pressure measurement. The measured values are continuously recorded on a calibrated circular chart which is rotated at a constant speed by a mechanical or electric clock. Control of the process variable is provided electrically. Each Pen Basic Type Number No. of Measuring Measured Variable Points 1 Temperature (Fluid expansion system) 2 Pressure (`C' Spring­ 316 st.steel) 3 Pressure (Spiral Bourdon ­ phosphor bronze) 4 Pressure (Spiral Bourdon ­ 321 st.steel) 5 Pressure Capsule Stack ­ beryllium copper) 6 Pressure (Diaphragm Stack ­ beryllium copper) 7 Relative Humidity (Goldbeater skin) ­ External 9 Pressure (Coiled Tube ­ 316 st.steel Alarm or Control Mode No. 1 17 Record only Electric Alarm/Control with Relay Output 00 Two Step 01 Two Step 05 Three Step 06 Three Step 09 High-low 03 Double 2 Step 04 Double 2 Step Electric Alarm/Control Contacts only ­ no Relay 60 Two Step 61 Two Step 65 Three Step 66 Three Step 69 High-Low 63 Double 2 Step 64 Double 2 Step ­Contact ­Contact ­Contact ­Contact ­Contact ­Contact ­Contact Mode C Mode A Mode AA Mode CC Mode CA Mode D Mode B ­ Set Points No. 2 Nos. 3 & 4 ­ ­ ­ Programme Control Cam (Single Pen only) ­ 5 One C10 pen Recorder with 105mm 6 Two pen pen travel on circular chart Position of Pen in relation to Set Point when Relay is energised Above Below Below Above Above Above/Above Below/Below ­ ­ Below Above Below ­ ­ None, or any combination applicable to Set Points No. 1 & 2 ­ ­ ­ ­ ­ ­ ­ or C or C or C or C Contact Action at Set Point when Pen moves towards outside of Chart Make Break Break Make Make Make/Make Break/Break ­ ­ Break Make Break ­ ­ None, or any combination applicable to Set Points No. 1 & 2 ­ ­ ­ ­ ­ ­ ­ or C or C or C or C Notes: Code No. is built up thus: Two Pen C106/3 00/1 17 ( Two Pens No. 1 Pen ­ Pressure (Bourdon) ­ 2 Step Elec. Alarm with Relay No. 2 Pen ­ Temperature ­ Record only One Pen Temperature Double 2 Step ­ Contacts only (no relay) Programme Cam 2 ( Single Pen C105/1 1 63 C ( Specification General: Chart diameter Writing width Intrinsic error Operating temperature limits Operating humidity limits Zero error due to ambient temp. variations Chart speeds Chart drive Power supply voltage and frequency Mounting Temperature measuring instruments: Measuring systems Maximum length capillary Minimum span Maximum span Span limits Pressure measuring instruments: Measuring system Minimum span Maximum span Span limits Connection size Humidity measuring instruments: Measuring systems Sensitive hygroscopic membrane and fluid filled system for temperature measurement, or wet and dry bulb fluid expansion systems. 20 to 100% R.H. (hygroscopic membrane); 0 to 40oC (fluid filled systems) Operating temperature limits Operating humidity limits Maximum length of capillary (wet and dry bulb system) Electric alarm or control: Instrument contacts Contact action Relays 20mA inductive or 30mA non-inductive load max. Make above or below set point as required Delayed action double pole change-over, 5A, 240V 50Hz non-inductive load, as standard (Refer to wiring Diagram, p.14). Energised above or below set point as required. 350mm wide; 137mm deep; 350mm high (Temp & R.H. 582mm high) 318mm diameter 25mm 10kg 30m (each bulb) 0 to 40oC 30 to 85% R.H. Capsule stack, Bourdon tube or coiled tube 0 to 1 bar vacuum or pressure. 1200 bar ­1 bar to 1200 bar Ranges up to 40 bar: a inch B.S.P.) with nut and tail Ranges over 40 bar: 2 inch B.S.P.) piece for 8mm tube Fluid expansion 30m 40oC 500oC ­ 30oC to +600oC 255mm 105mm ± 1% span maximum (±2% R.H. for hygroscopic membrane system) 678 678 ­10o to +50oC 0 to 80% R.H. Except for humidity recorders ±0.05% span/oC typical 1 rev every 12 hours, 24 hours or 7 days Synchronous electric motor or mechanical clock 200/250V or 100/120V, 50 or 60Hz Wall or panel Spans Relay action Overall dimensions Panel cut-out Maximum panel thickness Weight 3 INSTALLATION Mounting The instrument can be wall or panel mounted using the same fixing brackets. Do not install near any very hot apparatus, e.g. ovens, steam pipes or flues. Mount the recorder vertically in a position free from vibration and excessive temperature. For panel mounting remove the fixing screws and rotate the fixing brackets so that the instrument can be inserted in the hole in the panel. Return the brackets to their original position and insert the fixing screws. Tighten the screws until they bear against the back of the panel. Hygroscopic measuring instruments have external measuring elements requiring a clearance of 240mm below the case, and must be wall mounted. Temperature Recorder Pressure Recorder Panel Mounting 41 mm 83 mm 350 mm Panel cut-out dia. 318 mm Cable gland for w" conduit a" or 2" B.S.P. union with nut, and tailpiece Temperature and Relative Humidity Recorder Three holes at 120º on 340 mm p.c.d. to take 6.4 mm diam. screws for wall mounting Wall Mounting Fig. 2. 4 Access to Recorder To open the door, unlock, and turn the latch anticlockwise. As the door is opened the pen lifter raises the pen (or pens) away from the chart. Remove the chart (see page 6). If the instrument is connected to the mains, switch off the mains supply before dismantling further. For access to the terminal blocks remove the lower plastic plate from behind the chart by undoing the one retaining screw. For access to the relays and measuring systems, first remove the chart. Unhook the pens from their mounting (see Fig. 3.). Remove the three screws from the outside edge of the chart plate. (The pen lifter is secured by one of these screws and must also be removed). Lower the chart plate carefully. The chart motor is mounted on the back of the chart plate and if the motor is an electric one it remains connected to the terminal block in the lower part of the case. When replacing the chart plate reverse the above procedure. The coil on the pen lifter should be against the side of the case when the retaining screw is tightened. Process Connections To avoid confusion on instruments with more than one measuring system, setting pointers are labelled and Bourdon tube capillary connections to the instrument are painted with the same colours as the inks used for the corresponding pens. Process connections ­ temperature measuring instruments: Install the sensing element (bulb) of the instrument in the apparatus where the temperature is to be measured. The circulation around this element should be good and it should not be too close to any heating or cooling coil or other controlling medium. Fasten the capillary tubing at frequent intervals to rigid supports avoiding sharp bends of less than 50mm. radius anywhere along its length. The tubing must not touch or run close to any hot apparatus and should take the path least subject to temperature variation. If the temperature source is likely to move or vibrate allow one or two coils of 100mm. diameter of the capillary tube to eliminate stress of the tubing. If the atmosphere around the capillary tube is likely to be corrosive, paint the tube with anti-corrosive paint and ensure this is maintained. Process connections ­ pressure measuring instruments: Connect the Bourdon tube sensing element to the measuring point on the apparatus using pressure tubing of the same or similar material as the Bourdon tube and of sufficient pressure rating. Slope the run of the tubing so that any condensate is drained away from the instrument and does not affect the accuracy of measurement. For measurement of steam pressure or other hot vapours, form a condensate trap below the instrument. Process connections ­ humidity measuring instruments (wet and dry bulb): Install the sensing elements (bulbs) where the humidity is to be measured as described for temperature measuring instruments. The wet bulb (red pen system) is kept moist by a fabric covering, forming a wick which dips into a constant level water bath. A distilled water supply tank should be connected to the inlet feed pipe with a head of between 1 and 6 metres. It is important to install the bulbs in a position where the air speed is 3.6 metres per second or more. Below this speed inaccuracies of bulb depression may occur. The air should pass over the bulbs in such a direction that the water evaporating from the wet bulb does not pass over the dry bulb. The water must be kept clean and free from impurities. The temperature of the bath and all piping must not fall below 0oC. See also page 13. Electrical Connections Before making any connections to the instrument switch off the mains supply to be connected. All electrical connections are made to terminal blocks in the lower part of the case behind the lower section of the chart plate. Insert the leads through the cable gland in the underside of the case (see Fig. 2.) and make the connections as shown on the terminal labels or Wiring Diagram (page 14). The live line should be switched and fused with a 2 amp fuse. If the instrument is mounted on an insulated panel the case should be earthed. 5 OPERATION Mechanical Clock To wind the mechanical clock first remove the chart as described below. This exposes the clock key, which is permanently fitted in the front recess of the clock moulding. To wind the clock turn the key clockwise. Do not overwind. Fitting a Chart (Spider Clamp) Unscrew the milled head on the centre of the clock spindle until the spider retracts. Remove the chart. Fit the new chart over the spider head onto the locating boss. Rotate the chart until the pen tip coincides with the correct time line and clamp by screwing down the milled head. On a two-pen instrument the outer (red) pen, should be set on the correct time line. Fitting a Chart (Lever Clamp) ­ Fig 2(a) Release the clamp as shown. Remove the old chart. Fit the new chart on the spindle and rotate the chart until the pen tip is on the correct time line. Lower the chart clamp and press on it firmly to ensure that the locating pips pierce the chart. Release Set Pointer Adjustment To set the desired alarm/control point slacken the clamping knob at the right-hand end of the setting pointer (Fig. 5), position the pointer on the desired value and re-tighten the clamp. Clamp Fig. 2(a) Chart Lever Clamp Inking System The pen is tied during transit, but if dislodged it can be simply reassembled as shown. The pen arm is forked, one prong being pointed, the other curved. The pointed prong fits into a conical hole in screw S and curved one into the V shaped groove V. The pen is held in position by a spring X and hook Y. On the rear pen the hook Y faces towards the rear. The writing system uses fibre pen capsules. A dovetail Pen arm on the capsule fits into a slot at the end of the pen arm and the capsules are easily replaced when the ink is exhausted. To fit a capsule, pull the pen arm gently clear Capsule Pull and of its mountings S and V and unhook it from instrument. twist Slide off the used capsule and replace it with a new one of the appropriate colour. Where there are two measuring systems, different coloured inks are used to distinguish the traces. The fibre tip is protected by a plastic cap, which should be removed by pulling in line Plastic cap with its length, gripping the end only and gently twisting. Capsule dovetail Do not bend. The front pen (red) has a long fibre tip and the rear pen (green) a short tip. Dovetail slot Place the spring X over the hook Y and gently pull the Fig. 3 pen arm to locate it in its mountings S and V. Take care not to bend the pen ar ...