Labcal PRO High Precision Digital Thermometer / Logger for Pt100 and Thermocouple Sensors User Manual RoHS compliant Certificate No.
Labcal PRO Thermometer Contents 1. About the Labcal PRO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 a. Supply Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 b. Communication Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Labcal PRO Thermometer 1. About the Labcal PRO The Labcal PRO is a third generation instrument developed over a 25 year period from the very successful Labcal Plus thermometer.The original LABCAL instrument was launched in 1985. Like its predecessors, the Labcal PRO provides laboratory standard temperature measurement, many user features and greater versatility to extend the scope of applications. The Labcal PRO is fully characterised for Pt100 sensors and all major thermocouples J,K,N,T,E,R,S and B.
Labcal PRO Thermometer Additional manual procedures are not required to compute precise temperature readings since these are displayed directly; miscalculation errors are thus eliminated. Very high system accuracies, better than 25 milliKelvins can be achieved using probe matching. Corrections which are “programmed in” can be displayed for confirmation.Values can be changed by an authorised user at any time.
Labcal PRO Thermometer 2. Installation The instrument is for bench-top and portable use, folding ‘legs’ can be extended to provide a convenient viewing angle. All connections are made to the rear panel as indicated. Pt100 input Channel A Analogue output Thermocouple input Channel A Pt100 input Thermocouple input Supply Channel B Channel B Connection USB Flash Drive Communications 2a Supply Connection Refer to the rear panel illustration.
Labcal PRO Thermometer 2c Input Connection – Sensors Refer to the rear panel illustration. i) Pt100 sensors PRT - B PRT - A Platinum resistance thermometers must be fitted with a high quality D-plug and connected to input PRT-A and/or PRT-B as required. A 3 or 4 wire configuration can be used but they are connected differently as shown.The instrument will automatically sense which configuration is employed. Special care must be taken when connecting 3 wire Pt100 terminations to the connector pins.
Labcal PRO Thermometer Application note: Inputs are not isolated in the Labcal PRO which is primarily designed for laboratory applications and site calibration of industrial temperature sensors. Probes connected to the instrument must therefore be isolated from high voltage pick-up.
Labcal PRO Thermometer Main Menu Correct Main Menu Filter Main Menu Logging Main Menu Settings Main Menu Brightness Main Menu D>A Setup Main Menu A–B Null CJC Modes Next 8 Enter Escape Enter Escape Enter Escape Enter Escape Enter Escape Enter Escape Enter Escape Pt100 Corr Filter Len Next Corr Chan Next Coeff Chan Next Next Start Log Next Next Set Time Next INC/DEC to chenge ENTER to accept Next Escape View Log Next Smart Probe Next Write Log System Set Bright D>A Zero
Labcal PRO Thermometer 3a To read sensor temperature directly Press ‘SENSOR’ key to select the required type of sensor if different to that currently indicated Brief repeated key presses will step through the various types or holding the key depressed will auto-repeat (scroll through); this applies to other functions as well. NOTE: If for any selected channel the sensor is either not connected (including sensor open circuit) the display will show ‘BROKEN PROBE’.
Labcal PRO Thermometer It is possible to null out differences between the two sensors measured differentially as follows: Obtain the ‘NULL’ menu A-B Null by scrolling through the sub-menus until the menu appears. Press ‘ENTER’. The display screen shows: =USE NULL ON/OFF & VALUE= i) Acquiring a new null ii) Applying a measured null value The last null value will be applied such that the display value used is (A-B) – (Null value).
Labcal PRO Thermometer 3d SMART probe operation In the main menu, scroll down to ‘SETTINGS’ and press ‘ENTER’.The smart probe screen is shown. Press ‘ENTER’ to view the Smart Probe data (table of values). The probe tag and values are displayed when an appropriate probe is connected to the instrument. For custom coefficients In the correction menu, scroll down to ‘COEFF’ screens and follow the prompts to view or apply values and to specify relevant channel (ie A / B / Both / off). Press ENTER to select..
Labcal PRO Thermometer Press ‘ENTER” to select. Press ‘ESCAPE’ to return to the main display which will confirm the corrections status (CORRECT OFF OR CORRECTED). There are eight annunciations to indicate the status of corrections when taking readings with the Labcal PRO: Display screen annunciation 1) OFF 2) N/A 3) OUTSIDE 4) 5) 6) 7) 8) 3f No Pts Local T Local C Probe T Probe C Status (i.e.
Labcal PRO Thermometer 3g On-Board Logging Select ‘LOGGING’ in the MENU. Press ‘ENTER’ to view, write, start, erase log. Logged readings can be saved to file or to Flash Drive. Select the required memory slot (1 to 15) and enter the logging parameters. Follow the on-screen prompts. Press ‘ESCAPE’ to exit the logging menu.
Labcal PRO Thermometer 3i 3 or 4 Wire Recognition (Pt100) The Labcal PRO requires a minimum of 80 milliOhms lead resistance (e.g. 1 metre of 7 stranded 0.2mmΩ wire) to recognise a 4 wire probe. Otherwise the instrument will default (perhaps correctly) to 3 wire mode. If simulating a sensor input or calibrating the instrument, ensure 80mΩ lead resistance between the resistance source and D plug (e.g. 1 metre of 7 x 0.2mm Copper Cable).
Labcal PRO Thermometer Manual CJ This is used when thermocouple readings need to be referred to 0°C or so some other reference temperature. Selection is carried out as follows: Press ‘MENU’ then press ‘NEXT’ repeatedly until the CJC menu is obtained. Press ‘ENTER’. The display indicates: EDIT MANUAL CJC VALUE (DEG C) VALUE = External CJ This is used when thermocouple readings need to be referenced to a ‘physical’ temperature which exists in an external unit e.g. ice reference bath.
Labcal PRO Thermometer 4. Operation with a PC 4a Install the Software For use with a PC the software supplied with the Labcal PRO must be installed on the PC and communication established (on-line green indicator showing) via the USB lead supplied. System requirements for installing the software:Windows XP with at least one USB port. All Windows operating systems prior to XP do not support USB natively and are not recommended.
Labcal PRO Thermometer 4c Sensor Selection In the ‘Main’ window, the sensors currently selected for channel A and B are indicated in the relevant boxes.Alternative sensor types for each channel can be selected by clicking the drop down arrow to the right of the indicated sensor and clicking on the desired type. Note: it is essential to ensure that the sensor type selected corresponds to the actual sensor type connected to the instrument.
Labcal PRO Thermometer 4e Input Channel Select A or B from the ‘INPUT’ box in the top centre of the control panel; the measured value is displayed below in the ‘MEASURED VALUE’ box when ‘MEASURE NOW’ button is clicked. 4f Units and Resolution These are selected via the appropriate boxes in the ‘Control Panel’.
Labcal PRO Thermometer iii) Enter up to ten values of engineering units with 3 decimal places (e.g. 100.100Ohms & 0.000°C) corresponding to the temperature as stated on the calibration certificate for the ‘reference’ probe and click ‘SEND’; this sends to table of values to the instrument. Existing values will be overwritten. iv) Stored ‘correction’ values can be switched ON or OFF as required in the ‘Main’ window. v) Clicking ‘READ’ displays stored values (may be rounded up or down).
Labcal PRO Thermometer 4i SMART Probe Click on the ‘Probe ‘ tab to view the SMART probe window.This window is very similar to the one in the ‘ Tables’ tab and the values stored in the probe can be read, entered or edited. The probe Serial No. is shown and can be modified to suit. Click SAVE to save the values to the probe as required. 4j Log This tab is used to control PC logging of measured values (i.e. readings are saved to file on the PC and not on-board the instrument).
Labcal PRO Thermometer 4k Memory In this tab, readings stored on board the instrument can be retrieved and saved to file (normally in the same folder which contains the PC software). i) Click ‘READ’ to read the values. ii) Click ‘SAVE’ to save the readings to file. iii) Click ‘PRINT’ to print the readings. 5. Analogue (D to A) re-transmission output In the main menu, scroll down to D>A Setup and press ‘ENTER’. Follow the on-screen prompts to set up zero and span (degrees C) values.
Labcal PRO Thermometer 6. Instrument Re-Calibration It is recommended that this procedure is carried out by Labfacility or by an accredited laboratory facility. Calibration must only be performed by an authorised person and in the laboratory with a steady ambient temperature; access to the calibration level of the software is via a 5 digit ‘engineer’ code; this must be entered at the prompt by pressing ‘INC/DEC’ sequentially for the first digit.Then press ‘SENSOR’ or ‘UNITS’ to move to the next digit.
Labcal PRO Thermometer Connect a 100 Ohm resistance to the PRT-A input port.The instrument displays the value of the 100 Ohm input according to its previous calibration.The instrument now measures the precise resistance and displays the value. Press ‘ENTER’ and the value is sampled and entered. Press ‘ESCAPE’ if calibration of the channel is not required. a) The display screen now shows; CALIBRATION CH A PRT 100 OHMS Connect a 250 Ohm resistance to the PRT-A port.
Labcal PRO Thermometer 7. 24 Firmware update 1. Make a copy of the updated firmware file( e.g VI – 2 release.lab) to a folder 2. Rename the copied file “FIRMWARE.LAB” and send it to a flash memory stick. Ensure that the memory stick used is a “single volume” flash memory (i.e without additional volume such as a virtual CD or any additional files). 3.
Labcal PRO Thermometer 8. Specifications General Inputs/Ranges/Sensors Type Pt100 to IEC 751 (ITS 90 refers). -200ºC to +850ºC Ro = 100Ω 3 or 4 wire connection with automatic recognition (with manual override) Thermocouples to IEC 584 No isolation exists between inputs. Type Overall Accuracy Type S -50 to 1768ºC Type R -42 to 1766ºC Type B +254 to 1818ºC Noble Metal Type J -200 to 1200ºC Type K -195 to 1370ºC Type E -190 to 995ºC Type N -160 to 1300ºC Type T -193 to 399ºC Base Metal Pt100 ± 0.
Labcal PRO Thermometer Thermocouples Zero: negligible drift excluding CJC effect Scale: < ± 0.1ºC in 15ºC Warm-up Negligible under normal ambient conditions. Allow 5-10 minutes for full stability unless stored at low temperature, then 30 minutes minimum. Cold Junction Compensation Automatic on all thermocouple ranges. Better than ±1ºC max shift for ±10ºC ambient variation (100:1) or External via Pt100 on channel A or B or Manual input of CJ temperature value. Pt100 Sensor Current 0.
Labcal PRO Thermometer Common Mode Rejection 30V RMS applied between input and earth produces no measurable effect. Display 128 x 64 pixel OLED with diffused backlighting. Wide viewing angle, high contrast (adjustable). Front Panel Controls 9 membrane push-keys to control all instrument functions Mechanical/Case Metal bench top case / adjustable tilt Dimensions Overall 190mm(W) x 70mm(H) x 250mm(D) Weight 3.0kg approx.
Labcal PRO Thermometer Assessories and Order Codes Labcal PRO is supplied complete with switch mode power supply (90-260V, 50/60Hz), two Pt100 “D” connectors, operating manual and PC software. Precision Pt100 Probes Stainless steel probes, 6mm diameter with 2m screened PTFE lead and connector LP-L250: 250mm long, maximum 250ºC LP-H450: 350mm long, maximum 450ºC UKAS Calibration LP - UKAS: UKAS calibration for instrument alone. LP - SYS.CAL: UKAS calibration of instrument and sensor together at five points.
Certificate No. 4746 Data ref: 050109/OM/A v1.
