User manual ROTOTHERM RTH TEMPERATURE & HUMIDITY RECORDER

[. . . ] Operation - Control / Alarm Circuit 1 RTH100 Series Temperature & Humidity Recorder Instruction Manual Page 2 Specifications Range Temperature: Humidity: Measuring System Temperature: Humidity: Bi-metallic coil Hygroscopic membrane 0º to 40º or 20º to 100ºF 20 to 100% RH (see notes) Accuracy Temperature: Humidity: ±1% of the chart range ±2% within the limits 30 to 85% RH and 1º to 40ºC Chart Diameter: Drive: 240 mm diameter Electrical motor 24 hour or 7 day rotation as standard 3 hour, 6 hour, 12 hour and 28 day on application Outputs and Set Points Number of set points: Number of output relays: Relay contacts: Switched voltage max. : Switched current max. : Switched load max. : Insulation, contact to earth: Up to 4 set point adjustment by setting pointer against chart graduation Up to 4 Double pole changeover 30Vdc/277Vac 10A 150W/1660VA 2kV Power Supplies Voltage requirements: Power requirements: Insulation, contact to earth: 110V or 230V 50/60 Hz <20VA 2kV Environmental Data Storage temperature limits: Temperature instruments: Temperature/humidity inst. : Storage humidity limits Temperature instruments: Temperature/humidity inst. : -10º to +50ºC 0º to 40ºC 0 to 90%RH 20 to 85% RH Glass filled resin case with lockable hinged door with perspex window (polycarbonate to special order) Casing Mounting Ambient sampling Remote sampling Note Wall or flush panel or portable* Wall When panel mounting, a suitable air circulation must be provided to the duct intake and the inlet and outlet ports must not be restricted. * Free standing portable version available (ambient sampling type only) Weight Sampling Type 6. 5 Kg approx. Total sampling line length is restricted to 1 metre max (20mm OD) Where the temperature difference between sample air and case exceeds ±5ºC then the sample line must be thermally insulated Should the RH go above 85% RH it is possible that water droplets may form on the element. This may have a temporary or permanent affect on the calibration. 2 RTH100 Series Temperature & Humidity Recorder Instruction Manual Page 3 Alarm/Control Relays. In recorder-controller versions of the RTH100 Series two single-pole changeover delayed-action relays are fitted for each pen. [. . . ] The alarm will only be silenced while the pen remains outside contact limits: the temporary silence will be cancelled automatically when the pen returns to within limits and the alarm will sound again should the pen subsequently move outside limits once more. If an alarm caused by one of the two pens is temporarily silenced, the second pen will still cause the alarm to sound if it too also moves outside its contact limits. Pressing the mute push button once more will silence the second alarm. Installation Ideally the site chosen should be free from dust, corrosive fumes, vibration and extremes of temperature. Mounting the Controller The controller may be surface or flush panel mounted. For surface mounting, remove the screws holding the three brackets at the rear of the case, reverse and refit brackets with there ends projecting from the edges of the case. The bracket with the keyhole slot must remain at the top of the case. Drill three holes in the panel (or wall), of the size and at the centres given in Fig. Fit a screw of maximum diameter 6. 35 mm (1/4") in the top hole. Locate the instrument on this screw and fit two similar screws through the other two brackets to secure. For flush panel mounting, make a cut out to the dimensions given in Fig. Drill three holes and slot two to the cut-out edge as shown. Remove the nuts and washers from the studs projecting from behind the case flange, pass the instrument through the cut-out and refit the washers and nuts to secure the instrument. 3 RTH100 Series Temperature & Humidity Recorder Instruction Manual Page 4 Portable Mounting Surface Mounting Flush Panel Mounting All dimensions are in mm Fig 2. Outline Dimensions and Fixing Details 4 RTH100 Series Temperature & Humidity Recorder Instruction Manual Page 5 Access to Instrument To open the instrument door press the plunger of the door lock and pull the door forward from the right. As the door is opened the pen lifter raises the pen ( or pens) away from the chart. Remove the thread that secures the pens to the pen lifter for transit purposes. To make electrical connections and to set contacts remove the chart plate by loosening the three retaining screws and carefully lift out the chart plate via the finger hole ( care is necessary to avoid pen lifter interference with pens and control pointers ). Pull the bottom edge clear of the instrument and lower the chart plate from behind the pens. If the instrument already has a chart fitted this will need to be removed ( see Fig. 4. ). Electrical Connections BEFORE MAKING ANY CONNECTIONS TO THE INSTRUMENT ENSURE MAINS SUPPLY CABLE HAS BEEN ISOLATED FROM THE MAINS SUPPLY All electrical connections are made to terminal blocks in the lower part of the case behind the chart plate. Mains Supply and Relay Connections Insert mains supply cable (isolated) through cable gland in the underside of the case and connect to either the stand alone terminal block for recorders or the power supply board terminal block for controllers. A three core cable switched and fused 5 Amp should be used. Set the voltage selector switch ( adjacent to the transformer) to the required voltage. [. . . ] This operation needs care so as to not bend the pen arm and so cause a pen tension problem. Fig 5. Replacing Pen Arm from Mechanism 6 RTH100 Series Temperature & Humidity Recorder Instruction Manual Page 7 Contact Differential The procedure in the following paragraphs are for a single pen or dual pen instruments. With the chart plate removed, cut a segment of chart and place on to the chart clamp. Set the desired value pointer (1 or 2) to the required value by means of the setting knob (3 or 4). [. . . ]