User manual ROTOTHERM RTO20

[. . . ] MODEL RTO FILLED SYSTEM TEMPERATURE RECORDERS, RPO PRESSURE RECORDERS & RECORDERS CONTROLLERS (ELECTRICAL CONTROL) Instruction Manual Introduction Specification Description of Operation Receipt of Recorder Dimensions and Fixing Installation Mounting Access to Recorder Electrical Connections Process Connections Operation Fitting a Chart Inking System Set Point Adjustment Zero Adjustment Start-up Check Start-up Procedure Calibration Maintenance Replacing a Filled System Replacing a Pressure System Fault Finding Spares List 1 1 1 1 2 2 2 2 2 3 4 4 4 4 5 5 5 6 8 8 8 9 10 The chart drive and control system on this system may be operated from a mains voltage supply. The mains must be switched off before any mechanical adjustments (other than of the set pointer) or carrying out any maintenance or fault finding procedures. When making electrical adjustments observe the warning notes in the text. SPECIFICATIONS Accuracy Ambient Chart Drive +/- 1 % FSD. -20°C to +50°C Synchronous electric, battery or mechanical spring wound. [. . . ] With the chart plate removed, cut a segment of chart and place on the chart clarnp. Set the desired value pointer (1 or 2) to the required value by means of the setting knob (3 or 4). Move the actual value pen (5 or 6) until it just makes contact with the switch arm (7). Move the actual value pen (5 or 6) to the required deviation above the desired value pointer (1 or 2) and adjust the high contact (9 or 10) until it just makes contact with the switch arm (7). Low contact is set by moving the actual value pen (5 or 6) to the required deviation below the desired value pointer (1 or 2) and adjusting the low contact screw (8 or 11) until it just makes contact with the switch arm (7). Differential Pressure (Flg. 2) To obtain a zero reading, open balance valve B and close isolating valves A and C. START-UP CHECK Before putting the recorder into operation make the following checks to ascertain that it is correctly installed and operational. The pen(s) operate freely, write clearly on the chart and pass each other without touching. Measuring elements are correctly installed. Measuring elements are indicating correctly. Ensure that, in case of instruments with mechanical clocks, the clock is running and that the correct electrical connections have been made in instruments fitted with electrical clocks. Fit a new chart with its edge under the guide clips, set it to the correct time line and clamp the centre fixing device 2. 3. Warning Before adjusting the Contact Differential with the insulated spanner provided, ensure that the mains supply is isolated and use a continuity tester to establish switching points. 4. 5. START-UP PROCEDURE Be sure that all steps in the start-up check have been completed. Switch on the mains supply to the recorder. Adjust set point on desired alarm/control value (if applicable). Switch on mains supply to external electric alarm/control systems (if applicable). 3. 5 CALIBRATION Three adjustments are provided for calibration purposes:"Zero Adjustment" - to correct the lowest reading "Range Adjustment" - to correct highest reading "Scale Form Adjustment" - to correct midpoint reading 1. FOR INSTRUMENTS FITTED WITH TEMPERATURE SYSTEMS In the following paragraphs, the operation numbers refer to Fig 8. Adjust zero nut (4 or 14) until the range adjustment screw (5 or 6) is at right angles to the screwed link (7 or 8). Ease the pen arm boss (12) from the pen arm spindle taper and set the pen to the centre line of the chart. Press the boss firmly on the taper when positioned. When making this adjustment, do not turn the pen arm boss on its taper except against the slightest friction, or the pen arm retaining prongs will be bent. Immerse the bulb in the low temperature bath, allow sufficient time for the bulb to attain the bath temperature and adjust the zero nut (4 or 14) until the pen arm registers the temperature shown on the test thermometer. Transfer the bulb to the high temperature bath, allow sufficient time for the bulb to attain the bath temperature and note the position of the pen. [. . . ] If the upper system is faulty remove the two Bourdon securing screws (5) and slide the Bourdon, including overload spring assembly (2) off the screwed link (1). Leave the zero adjustment nut (4) and compensation washers (3) on the link (these will be required for the new system). Slacken the lock nut on the system adaptor (14) and remove the outlet plate securing screws (13), draw the outlet plate away from the case, taking care not to damage the second system of a duplex instrument. Unscrew the lock nut (14) and remove the system from the outlet plate, passing the capillary through the slot. [. . . ]