L200 User Manual Operating Instructions for L200-TC & L200-PT Temperature Monitor RoHS compliant Certificate No. 4746 www.L200temperaturemonitor.co.uk www.labfacility.co.
L200 Temperature Monitor Contents 1. About the L200 ...................................................................3 2. Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5 Front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . .
L200 Temperature Monitor 1. About the L200 L200 USB DIGITAL THERMOMETER/DATA LOGGER The L200 Pt100 and thermocouple thermometer can be used in conjunction with a PC to provide accurate, versatile 8 channel temperature measurement, scanning and logging of measured values. It can also be used as a ‘stand alone’ 8-channel indicator/logger and incorporates a digital display of measured temperature.
L200 Temperature Monitor 2. Installation Front panel Rear Panel L200-TC L200-PT Supply connection The L200 operates from a 6 to 9V dc supply. A suitable 90 to 250V 50/60Hz adaptor is supplied with the instrument, complete with alternative pin configurations for international supply outlets. Connect the adaptor output jack to the supply input socket on the rear panel; an on-off switch is not fitted, simply connect the supply.
L200 Temperature Monitor Sensor connections L200-TC, thermocouple inputs L200-TC Only the appropriate, miniature (flat pin) , colour coded and polarised thermocouple plug can be used for each input. Any type of thermocouple (eg K,N,T etc) can be connected to any input but each must be terminated in the correct type of plug, colour coded to suit the attached thermocouple type.The particular thermocouple type must be selected for each channel via the PC software.
L200 Temperature Monitor 3. Operation The L200 can be used with or without a PC as required. For the optimum accuracy, especially in the case of the thermocouple version (L200-TC), the instrument should be allowed due time to ‘settle’ in the ambient temperature of its location before use.This is important if it is moved between locations of greatly different ambient temperatures.
L200 Temperature Monitor Control panel In the L200 software window, double click on the ‘L200 Control Panel’ icon.The following window is opened: L200-TC L200-PT The online indicator flashes green when communications between the L200 and the PC are established (see System configuration on next page). The PC software automatically opens the Control Panel appropriate to either the L200-TC or L200-PT as connected.
L200 Temperature Monitor Sensor selection To find out which type of thermocouple is selected for each channel with the L200-TC, simply double click on the channel readout; the selection can be simply changed by clicking on the arrow in the ‘T/C type’ box and clicking on the desired type and then ‘send’. Note:The ‘calibration’ box in the window, may show y =mx +c with pre-determined values for m&c which are offset correction values allocated during production.These must not be altered and can be ignored.
L200 Temperature Monitor System configuration: Click on ‘configure/logging’ in the lower, left-hand corner of the window; the following ‘system configuration’ window is opened: In this window, the Comms Port is selected and instrument settings are made. Comms Port – Select the required port if this is not done automatically. The online indicator flashes green when communications between the L200 and the PC are established.
L200 Temperature Monitor Chart recorder display For a chart recorder (analogue) display of all 8 channels, click on chart; x and y axes are auto-scaled to suit readings.The chart recorder can be opened and closed as required. Logging Logging can be carried out on one of two bases; c) Real-time PC logging is started by clicking ‘Start’ in the control panel at any time, and stopped by clicking ‘Stop’. Readings are saved in Notepad in ‘.csv’ format, in the same folder as that in which L200 software resides.
L200 Temperature Monitor d) L200 on-board logging is set up by clicking ‘Configure/logging’ in the control panel. The following ‘logging control’ window is opened. The logging interval for each chanel is set up (common) and sent to the instrument by clicking ‘send’. Logging is started by selecting ‘on’ in the ‘status’ box and clicking ‘send’. It is stopped by selecting ‘off’ and clicking ‘send’. Logged readings are downloaded to file in ‘.csv’ format in the PC by clicking ‘download’.
L200 Temperature Monitor Calibration Checking The L200 is designed to be highly accurate and highly stable as indicated in the specification. Self-calibration is performed during each A/D (analogue to digital) conversion cycle for example; routine re-calibration is basically unnecessary. However, a calibration checking facility is incorporated in the L200-TC and this allows the user to easily and conveniently ascertain if re-calibration is necessary.
L200 Temperature Monitor b) In the main control panel, click ‘millivolt’ in the display box (just below ch6 readout) The L200 display will show the corresponding temperature for a 10mV input to the relevant channel; they can be ignored during this procedure. c) Observe the readout value of the chosen channel input. If the calibration of the instrument is correct, the readout will indicate 10.00(00). Note:The ‘ref ’ value is 10.
L200 Temperature Monitor 2. Re-calibration – thermocouple version (L200-TC) To be conducted only by authorised & trained personnel using the appropriate equipment. Unauthorised re-calibration may invalidate the instrument warranty and would invalidate any applicable calibration certificate.
L200 Temperature Monitor Zero & Span Calibration L200-TC a) Link all eight thermocouple inputs in parallel and apply 0.0000mV signal to them. A 61⁄2 digit DVM preferably UKAS certified should be used to check the applied voltage. b) Click on the ‘All’ box to the left of the ‘calibration’ window (selects all channels for calibration). If preferred, individual channels can be calibrated by selecting and clicking on the appropriate tick box.
L200 Temperature Monitor 3. Quick calibration check – Pt100 version (L200-PT) The PC software must be running and the USB lead connected between the L200 and the PC. With communications established (online indicator in the Control Panel flashing green); C B A a) Connect the 100.000 Ohm precision resistor between terminals A & B on input 1 (or other input to choice). Link terminals B & C with copper wire if a third wire is not fitted to the resistor.
L200 Temperature Monitor 4. Re-calibration of Pt100 version (L200-PT) To be conducted only by authorised and trained personnel using the appropriate equipment. Unauthorised re-calibration may invalidate the instrument warranty and would invalidate any applicable calibration certificate. The PC Software must be running and the USB lead connected between the L200 and the PC, with communications established (on-line indicator in the control panel flashing green).
L200 Temperature Monitor Zero & Span calibration L200-PT a) Connect a 100.00 Ohm precision resistor to input 1 as indicated in 3a) and enter this value in the top R box to the left. b) Click on the ch1 check box to select ch1 for calibration. c) In the main control panel, click ‘resistance’ in the display box (just below ch6 readout). d) Click ‘reset’ and ‘restart’ (this clears the existing calibration data and prepares the selected channel for calibration). e) Click ‘next’ when ready.
L200 Temperature Monitor 4. Specifications at an ambient temperature of 20°C Input / Ranges Thermocouple to IEC 584 Type J -200°C to 750°C Type K -200°C to1200°C Type T -200°C to 350°C Type E -200°C to 900°C Type N 0°C to 1300°C Type R 0°C to 1760°C Type S 0°C to 1760°C Type B 250°C to 1800°C Pt100 to IEC751, 3 wire -200°C to 850°C Note: all inputs are non-isolated and sensors must be of insulated construction. Accuracy Thermocouples better than +/- 0.1°C +/-0.
L200 Temperature Monitor PC Interface Power supply Logging interval On-board memory PC software 8 x Pt100, terminal blocks USB 6Vdc (5.5-9.
L200 Temperature Monitor 5. Suggested application Probe comparison calibration Temperature sensors may need to be routinely checked and/or calibrated in accordance with specified procedures.There are various ways of achieving such compliance which typically involve sending the sensors to an accredited laboratory for certification, an expensive and time consuming procedure.
L200 Temperature Monitor 1 2 3 4 5 6 7 8 USB PC 22 MULTI-CHANNEL INDICATOR/LOGGER REF PROBE UP TO 7 PLANT TEMPERATURE SENSORS ° ° ° ° ° ° ° ° DRY BLOCK CALIBRATOR
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