Cole Parmer Instrument Company
Thermometers
Digi-Sense Dual J-T-E_K Thermometer Model No 91100-40 User Manual Rev 0 Aug 2003
User Manual
36 Pages
Preview
Page 1
THERMOCOUPLE THERMOMETER
Dual J-T-E-K® MODEL NO. 91100-40
Cole-Parmer Instrument Co. 625 East Bunker Court Vernon Hills, Illinois U.S.A. 60061-1844 (847) 549-7600 (847) 247-2929 (Fax) 800-323-4340 www.coleparmer.com e-mail: [email protected] A-1299-0632 Edition 07 68X309908 Rev. 0 08/03
CERTIFICATE OF CONFORMANCE This thermometer was calibrated using equipment traceable to the National Institute of Standards and Technology (NIST). This instrument conforms to NIST monograph 175 revised to ITS-90. The accuracy of the thermometer at the time of calibration was within specifications stated in the operating manual. Model No.:__________________________ Serial Number:______________________ Date placed in service:________________ To purchase an NIST certificate of traceability with test data and test date for meter and probe please contact: Cole-Parmer Instrument Company 625 East Bunker Court Vernon Hills, Illinois, U.S.A. 60061-1844 Toll-free: 800-323-4340
INTRODUCTION
This versatile hand-held instrument provides highly accurate temperature measurements in Celsius, or Fahrenheit, using a wide range of thermocouple types. The temperature range for each type thermocouple is listed in the following chart.
TYPE
°C
°F
J K T E
–200 to 1000 –250 to 1372 –250 to 400 –250 to 1000
–328 to 1832 –418 to 2501 –418 to 752 –418 to 1832
1
The instrument is designed for easy operation and includes the following features: • Operator selection of temperature scale • Resolution of 0.1° from −150°C to 999.9°C (−238°F to 999.9°F) • LCD with three four-digit displays • Two (2-blade female) ANSI mini-connector inputs • Hold feature for temporarily retaining a reading • Two-point field calibration capability • Low battery warning • Stores up to 25 readings • Scrolls through all stored readings • Displays MIN and MAX readings • Scrolls between T1, T2, and T1-T2 readings • Built-in tilt stand for easy hands-free operation
2
SAFETY PRECAUTIONS THIS INSTRUMENT IS WARNING DESIGNED TO ACCEPT LOW LEVEL SIGNALS SUPPLIED BY STANDARD THERMOCOUPLES. UNDER NO CIRCUMSTANCES SHOULD THE INPUT VOLTAGE EXCEED THE SPECIFIED 50V RMS. DO NOT USE OR STORE
CAUTION THIS INSTRUMENT IN
MICROWAVE OVENS OR ANY ABNORMALLY HOT OR COLD AREAS. WEAK BATTERIES SHOULD
CAUTION NOT BE LEFT IN THE INSTRUMENT. DEAD BATTERIES CAN LEAK AND CAUSE DAMAGE TO UNIT. VOLTAGES PRESENT AT DANGER THE THERMOCOUPLES MAY ALSO BE PRESENT AT THE BATTERY TERMINALS. ALWAYS DISCONNECT THE THERMOCOUPLE WHEN CHANGING BATTERIES. TO PREVENT IGNITION OF WARNING A HAZARDOUS ATMOSPHERE, BATTERIES MUST ONLY BE CHANGED IN AN AREA KNOWN TO BE NON-HAZARDOUS. DE PREVENIR AVERTISSEMENT LAFIN ’ I N F L A M M AT I O N D’ATMOSPHERES DANGEREUSES, NE CHANGER LES BATTERIES QUE DANS DES EMPLACEMENTS DESIGNES NON DANGEREUX. TO PREVENT IGNITION OF
WARNING A HAZARDOUS ATMOSPHERE BY ELECTROSTATIC DISCHARGE, CLEAN WITH DAMP CLOTH.
3
SPECIFICATIONS THERMOCOUPLE PROBES Type
Temperature Range
Type J: –200°C to 1000°C (–328°F to 1832°F ) Type K: –250°C to 1372°C (–418°F to 2501°F ) Type T: –250°C to 400°C (–418°F to 752°F ) Type E: –250°C to 1000°C (–418°F to 1832°F ) Accuracy > –150°C: ±0.1% of reading, ±0.4°C (±0.7°F) Accuracy < –150°C: ±0.25% of reading, ±1°C (±2°F) Linearization: Conforms to NIST monograph 175 revised to ITS-90. Input Protection: 50V rms Conversion Rate: Reading 0.6 seconds per update. Connector: Two-blade female ANSI mini-connector inputs. Battery Size: Two AA, 1.5V alkaline ANSI-L40, IEC-LR6 Life:
750 hours continuous, typical
Display: LCD with 0.4 in high characters main readout and 0.2 in high characters secondary displays, 4 digits each display plus various annunciators.
4
Temperature/Humidity Range Operating: Stated Accuracy: Useful Range: Storage: Humidity:
18°C to 28°C (64°F to 82°F) 0°C to 40°C (32°F to 104°F) −40°C to 65°C (−40°F to 149°F) 10% to 90% (non-condensing)
Dimensions 3 cm D x 8.4 cm W x 15.8 cm H (1.2 in x 3.3 in x 6.2 in) Weight with batteries: 227 grams (8 ounces) Ingress protection: Meets IEC-529 IP-54 for dust and water-resistant enclosures. Intrinsic safety This product is energy limited for intrinsically safe operation in hydrogen atmospheres per Class I, Division 1, Groups A, B, C, and D hazardous (classified) locations for UL per UL913 and CSA per C22.2 No. 0-M1982 and No. 157-M1987. Maximum surface temperature: 135°C (T4); UL file No. E182612 (1997). Compliance (For CE Mark) EN61326-1/A1: 1998 (EU EMC Directive)
5
BATTERY INSTALLATION AND REPLACEMENT WEAK BATTERIES SHOULD CAUTION NOT BE LEFT IN THE INSTRUMENT. DEAD BATTERIES CAN LEAK AND CAUSE DAMAGE TO UNIT. VOLTAGES PRESENT AT
DANGER THE THERMOCOUPLES
MAY ALSO BE PRESENT AT THE BATTERY TERMINALS. ALWAYS DISCONNECT THE THERMOCOUPLE WHEN CHANGING BATTERIES. TO PREVENT IGNITION OF
WARNING A HAZARDOUS ATMOSPHERE, BATTERIES MUST ONLY BE CHANGED IN AN AREA KNOWN TO BE NON-HAZARDOUS. AFIN
DE
PREVENIR
AVERTISSEMENT L ’ I N F L A M M A T I O N D’ATMOSPHERES DANGEREUSES, NE CHANGER LES BATTERIES QUE DANS DES EMPLACEMENTS DESIGNES NON DANGEREUX.
6
If battery indicator turns on, battery life is approximately 8 to 10 hours. The battery indicator will start blinking with less than 1 hour of life remaining.
AT THIS POINT BATTERY MUST BE CHANGED. IF BATTERY VOLTAGE GOES TOO LOW, DISPLAY WILL GO BLANK. See SPECIFICATIONS for battery type. 1. Before changing battery, turn instrument off and disconnect thermocouple(s). 2. Loosen screw and lift battery cover off back of case. 3. Remove the two AA batteries. 4. Insert two new batteries observing polarity. 5. Install cover and tighten screw.
7
CONNECTING A THERMOCOUPLE Note: Be sure your instrument setting (J, T, E or K) matches the thermocouple you are using. Use the correct thermocouple type for your instrument. Using an incorrect thermocouple type will result in erroneous readings. Thermocouples are color coded by type using the North American ANSI color code as follows:
TYPE
COLOR
J K T E
Black Yellow Blue Purple
Thermocouple connectors have one wide blade and one narrow blade. Do not force connector in backwards. Connect thermocouple(s) to receptacle at top of instrument.
If only one thermocouple is being used, it can be connected to either T1 or T2. The thermometer will automatically determine which connector is being used. When two thermocouples are used, connect one to the T1 connector and one to the T2 connector. Thermocouple wiring polarity must be correct. If readings decrease as the temperature increases, the thermocouple wires may be reversed. The red wire is negative for thermocouple wires manufactured in North America. 8
QUICK SETUP Note: Review warnings on page 6. 1. Install batteries. 2. Connect thermocouple(s). 3. Press the ON/OFF key. The thermometer performs a self-test and all display digits and indicators, as shown below, should remain on for approximately one second. 4. Use J-T-E-K key to select the correct thermocouple and the °C/°F key to select the desired scale.
If a thermocouple has not yet been connected to one or more inputs on the instrument, you will see this display:
This message also appears if a thermocouple is broken. No measurements can be made while this warning is displayed. 12
COMPLETE SETUP PROCEDURE The setup procedure is used to select the temperature scale, resolution, and thermocouple type. NOTE Selected settings are stored in memory and will remain in memory even after power is turned off, or while batteries are being replaced. SELECTING TEMPERATURE SCALE Select °C or °F by pressing the °C/ °F key. Each time the key is pressed the temperature scale will switch. Switching between °C and °F can be done at any time during operation. Each time you turn the instrument on, it will power up with the same settings that were set when the unit was last turned off. SELECTING RESOLUTION Select 0.1° or 1° resolution by pressing the 0.1°/1° key. This key toggles between the two resolutions. When measuring temperature above 999.9° or below −150°C the thermometer automatically autoranges to 1° resolution. SELECTING THERMOCOUPLE TYPE Select the thermocouple type, either J, T, E, K, by pressing the J-T-E-K key. Each push of the key will step to the next type thermocouple. The selected thermocouple type is indicated by the annunciators in the lower right corner of the display. Continue with the OPERATING PROCEDURES section or turn the instrument OFF by pressing the ON/OFF key again. The display will blank.
13
OPERATING PROCEDURES The unit will always power up with the upper display showing T1 unless T1 is not connected. If only T2 is connected at power up, the upper display shows T2 and the lower left display indicates T1 is open. If thermocouples are not connected to T1 or T2 at power up, the upper display indicates an open T1 and the lower right display indicates an open T2. If you are in single probe mode and the probe is moved to the other connector or to restore the dual probe mode, turn power OFF then back ON. For optimum operation, allow about one minute for ambient temperature stabilization. If the unit has been stored at an extreme ambient condition, more time may be needed. BASIC TEMPERATURE MEASUREMENTS Check that the thermometer is turned on, the probe(s) connected, the desired resolution 0.1° or 1° is selected, and the desired scale °C or °F, is selected. Single Probe Measurements The thermometer will automatically determine if T1 or T2 connection is being used. Initially the upper display will indicate the measured temperature and the annunciator will indicate which probe is making the measurement. One of the lower displays will indicate open and the annunciator will indicate which probe is open. Pressing the T1/T2 key will cause the thermometer to go into the single probe differential mode described later. Temperatures > 999.9° have a resolution of 1° and therefore no decimal will be present.
14
Dual Probe Measurements The thermometer will automatically determine if one or two thermocouples are connected. When two thermocouples are connected, the upper main display will initially show T1 and the lower right display will show T2. Pressing the T1/T2 key once will cause the upper display to show T2 and the lower left display to show T1. Pressing the T1/T2 key again will cause the upper display to show T1-T2, the lower left display to show T1, and the lower right display to show T2. MAXIMUM READINGS The maximum reading function displays the maximum reading since power up or since the last time the clear function was used. The maximum reading function is ideal for monitoring unattended operations while continually displaying every temperature change that occurs. The maximum and minimum values are sensed and automatically stored until you are ready to observe the reading. Do not turn the instrument OFF when a maximum or minimum temperature value may be needed; MAX/MIN memory contents will be lost. Factory Calibration will be maintained.
15
Single Probe Measurements The displayed information depends on whether you are using a single probe in the dual probe mode or have changed to the single probe differential mode by pressing the T1/T2 key. If you are using a single probe and in the dual probe mode, momentarily press the MAX ▲ key. The MAX annunciator turns on. If the probe is connected to T1 the maximum reading will be shown in the lower left display. If the probe is connected to T2 the maximum reading will be shown in the lower right display. If a higher maximum occurs while in the MAX mode, the higher reading will be displayed. To turn off the maximum reading, press the MAX ▲ key again. If you are in the single probe differential mode, momentarily press the MAX ▲ key. The MAX and MIN annunciators turn on and both the maximum and minimum readings appear in the lower displays. The minimum will be on the left display and the maximum on the right display. If a higher maximum or lower minimum occurs while in the MAX mode, the higher reading will be displayed. To turn off the maximum reading, press the MAX ▲ key again.
16
Dual Probe Measurements Momentarily press the MAX ▲ key. The MAX annunciator turns on, and both maximum T1 and T2 readings appear in the lower display. The T1 reading is on the left display and the T2 reading is on the right display. Press MAX ▲ key again to cancel. Clearing a Maximum Reading Press the CLEAR key then the MAX ▲ key. The maximum memory will be cleared. MINIMUM READINGS The minimum reading function displays the minimum reading since power up or since the last time the clear function was used. While continually displaying every temperature change that occurs, the maximum and minimum values are sensed and automatically stored until you are ready to observe the reading. Do not turn the instrument OFF when a maximum or minimum temperature value may be needed; MAX/MIN memory contents will be lost.
17
Single Probe Measurements The displayed information depends on whether you are using a single probe in the dual probe mode or have changed to the single probe differential mode by pressing the T1/T2 key. If you are using a single probe and in the dual probe mode, momentarily press the MIN ▼ key. The MIN annunciator turns on. If the probe is connected to T1 the minimum reading will be shown in the lower left display. If the probe is connected to T2 the minimum reading will be shown in the lower right display. If a lower minimum occurs while in the MIN mode, the lower reading will be displayed. To turn off the minimum reading, press the MIN ▼ key again. If you are in the single probe differential mode, momentarily press the MIN ▼ key. The MAX and MIN annunciator turns on and both the maximum and minimum readings appear in the lower displays. The minimum will be on the left display and the maximum on the right display. If a lower minimum or higher maximum occurs while in the MIN mode, the new readings will be displayed. To turn off the minimum reading, press the MIN ▼ key again. Dual Probe Measurements Momentarily press the MIN ▼ key. The MIN annunciator turns on, and both minimum T1 and T2 readings appear in the lower display. The T1 reading is on the left display and the T2 reading is on the right display. Press the MIN ▼ key again to cancel. Clearing a Minimum Reading Press the CLEAR key then press the MIN ▼ key. The minimum memory will be cleared.
18
DIFFERENTIAL READINGS (T1-T2) The differential function is used to compare two different measurements and display the difference between them. Differential measurements can be made using either one probe or two probes. Single Probe Measurements For single probe measurements, one measurement is stored as the reference measurement, then each following measurement is compared to the reference. The reference measurement is viewed on the lower left display, the differential value is shown in the lower right display and the main display shows the present T1 or T2 reading. 1. Place probe at first measurement point. 2. Press the T1/T2 key to store this reference temperature. The ∆T and M= annunciators will be on and the reference temperature will be displayed on the lower left display. The ∆T indicates that the differential mode is selected and the M= indicates that a reference temperature has been stored. Any time after this that the T1/ T2 key is pressed, the M= value will be updated to the present value shown in the main display. 3. Place the probe at the second measurement point. The main display will immediately show the new measured temperature and the lower right display will immediately show the difference between the reference temperature and the present temperature point.
19
Dual Probe Measurement 1. Connect the two probes to the two points of measurement. The lower left display will indicate the T1 temperature, the lower right display will indicate the T2 temperature. 2. The main display can be scrolled between displaying T1, T2 or the differential temperature T1T2 by repeatedly pressing the T1/T2 key. To display the differential temperature press the T1/T2 key until the T1-T2 annunciator to the right of the main display is on. HOLD FUNCTION key to retain the reading on Press the HOLD the display. Press HOLD key again for normal operation. Maximum/Minimum Hold Readings Press the MAX ▲ key, then press the HOLD key. To turn off the HOLD function and return to normal operation, press the HOLD key again. To clear the maximum readings, press the CLEAR key, then the MAX ▲ key. Minimum/Hold key. Press the MIN ▼ key, then press the HOLD To turn off the HOLD function and return to normal operation press the HOLD key again. To clear the minimum readings, press the CLEAR key, then the MIN ▼ key. STORED READINGS The store function allows you to store up to 25 readings. Both T1 and T2 readings are stored. To store readings proceed as follows:
20
1. Momentarily press the STORE key. Both T1 and T2 are stored. The upper main display will momentarily show the storage location number and the STO annunciator will be on. After three seconds the storage number will be replaced with the temperature reading but the STO annunciator remains on to indicate a temperature reading has been stored. The STORE key may be pressed as fast as once per second. 2. Repeat step 1 for all the points to be recorded up to a maximum of 25. Each time the STORE key is pressed the new reading will be stored and the upper main display will show the storage location number for about 3 seconds. After 25 stored readings, the next time the STORE key is pressed the main display will indicate FULL. RECALL READINGS This function allows the stored readings to be recalled. RECALL shows each stored reading individually. To recall readings proceed as follows: 1. Momentarily press the RECALL key, the first stored reading will be displayed on the lower display and the store number “1” will be displayed on the upper display. The STO, and RCL annunciators will be on. 2. To step through the readings, press the MIN ▼ key or the MAX ▲ key. Each press of the key will advance to the next reading in sequence. 3. To return to normal operation press any other key except ON/OFF, MAX ▲, MIN ▼ or RECALL. Clearing Stored Readings Press the CLEAR key, then the STORE key. The stored readings in memory will be cleared. 21