Digi-Sense 35427-51 User manual

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Thermistor Thermometer
MODEL NO. 93210-00
68X309902 R.0 08/03
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CONFORMANCE
This thermometer was calibrated using equipment traceable to the National Insti­tute of Standards and Technology (NIST).
This instrument conforms 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:________________
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INTRODUCTION
This versatile hand-held instrument provides highly accurate temperature measurements. The instru­ment is designed for easy operation and includes the following features:
• Operator selection of Celsius or Fahrenheit scale
• Resolution of 0.1°
• Four-digit LCD
• Hold feature for temporarily retaining a reading
• Field calibration capability
• Low battery warning
• Built-in tilt stand for easy hands-free operation
• Standard 1/4 inch (6.3mm) phone jack connector input
• Operates with a wide selection of probes
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SAFETY PRECAUTIONS
DANGER
ALSO BE PRESENT AT THE BATTERY TERMI­NALS. ALWAYS DISCONNECT THE THERMO­COUPLE WHEN CHANGING BATTERIES.
WARNING
LOW LEVEL SIGNALS SUPPLIED BY STAN­DARD 400 SERIES THERMIST ORS. UNDER NO CIRCUMSTANCES SHOULD THE INPUT V O LT­AGE EXCEED THE SPECIFIED 10 V RMS.
CAUTION
MICROWAVE OVENS OR ANY ABNORMALLY HOT OR COLD AREAS.
CAUTION
STRUMENT . DEAD BATTERIES CAN LEAK AND CAUSE DAMA GE T O UNIT.
VOLTAGES PRESENT AT THE THERMISTORS MAY
THIS INSTRUMENT IS
DESIGNED TO ACCEPT
DO NOT USE OR STORE THIS INSTRUMENT IN
WEAK BA TTERIES SHOULD NOT BE LEFT IN THE IN-
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SPECIFICATIONS
THERMSITOR PROBES
YSI 400 series (2252 ohm at 25°C) –40.0 °C to 125.0 °C (–40.0 °F to 257.0 °F )
Out of range display: “Ur” , “Or” , “oPEn” Resolution: 0.1° Accuracy
+0.2 °C (+0.4 °F)
Display: 4-digit LCD with 0.4 inch high numerals. Display update rate: 0.5 sec per update. Input: One probe with 1/4 inch (6.3mm) phone
jack connector.
Input Protection: 10V rms Battery: Two AA, 1.5V alkaline ANSI-L40,
IEC-LR6.
Battery Life: 200 hours continuous, typical. Low battery indication
Battery Symbol on when 8 to 10 hours of battery life remains.
Auto Shutoff: 17 minutes after last key press. Operating:
Stated accuracy: 18°C to 28°C (64°F to 82°F) Useful range: 0°C to 40°C (32°F to 104°F) Storage: –40°C to 65°C
Humidity: 10% to 90%
(–40°F to 149°F)
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0867-0868body.p65 8/15/01, 1:05 PM3
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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 g rams (8 ounces) Ingress protection: Meets IEC-529 IP-54 for dust-
and water-resistant enclosures.
Compliance (For CE Mark): EN61326-1/A1: 1998
(EU EMC Directive)
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BATTERY INSTALLATION AND
REPLACEMENT
DANGER
ALSO BE PRESENT AT THE BATTERY TERMI­NALS. ALWAYS DISCONNECT THE PROBE WHEN CHANGING BA TTERIES.
CAUTION
INSTRUMENT. DEAD BATTERIES CAN LEAK AND CAUSE D AMAGE TO UNIT.
VOLTAGES PRESENT AT THE THERMISTOR MAY
WEAK BA TTERIES SHOULD NOT BE LEFT IN THE
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If battery indicator turns on, battery life is approxi­mately 8 to 10 hours.
See SPECIFICA TIONS f or battery type.
1. Before changing battery , turn instrument off and disconnect probe.
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.
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CONNECTING A THERMISTOR
Use the correct thermistor (series 400) for your in­strument. Using an incorrect probe type will result in erroneous readings. (Series 500 thermistor probes may be used along with the supplied cor­rection chart to convert meter readings to actual temperature). Insert the 1/4 inch plug into the mat­ing connector on the top of the instrument.
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OPERATION
1. 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 two seconds.
2. If a probe is not connected or if the probe is de­fective, the displa y will indicate “oPEn”.
3. Select °C or °F by pressing the °C/°F key. Tem­perature scale can be switched at any time. The thermometer retains the last selected scale the next time you turn the power on.
4. For optimum instrument accuracy, allow one minute for ambient temperature stabilization. If the unit has been stored at an extreme ambient condition, more time will be needed.
When taking temperature measurements, allow time for the reading to stabilize. Multiplying the time constant of the probe by 5 will give you the ap­proximate time required.
If desired, press the HOLD key to retain the read­ing on the display . Press HOLD key again for nor­mal operation.
The display will show “Ur” (under range) or “Or” (over range) if the temperature reading is out of range of the instrument.
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FIELD CALIBRATION
The thermometer is factory calibrated and does not require calibration before use. The CAL function al­lows single point calibration of the thermometer, at 0°C (32°F) to compensate for probe offset error. It is not necessary to perform a field calibration to obtain specified meter accuracy . Use the field cali­bration feature to improve thermometer/probe accuracy.
1. Follow steps 1 through 4 in FIELD CALIBRA- TION CLEAR/UNLOCK section.
2. Pack sensing end of probe in a container tightly packed with crushed ice and filled with distilled water. Allow temperature to stabilize.
3. Press and release the CAL key to enter the cali­bration mode.
4. The display will momentarily show “CA” and then the temperature reading starts blinking.
5. If the measured temperature is from –5°C to 5°C (23 to 41°F), when the temperature reading is stable, press the HOLD key to confirm calibration.
The display will momentarily show “CO” and the reading will be set to 0°C (32°F). The CAL indi­cator will turn on, indicating a field calibration is active.
The field calibration is automatically
locked as well.
If “Err” is displayed, either the displa yed reading is outside the above limits or the batteries are weak.
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FIELD CALIBRA TION CLEAR/UNLOCK
The calibration clear/unlock feature will cancel any previous field calibration (the thermometer reverts to the default factory calibration) and also enables the field calibration operation.
1. Turn the thermometer off.
2. Hold the CAL key down while pressing the ON/ OFF key .
3. Unit will first display 8888 then the firmware ver­sion number
4. When the CAL key is released, the unit will re­turn to measurement mode.
FIELD CALIBRA TION LOCKOUT
The calibration lockout feature prevents any field calibration changes. The lockout remains in eff ect until a clear/enable has been performed. Use the following procedures to lockout the field calibration operation.
Lockout Procedure
1. Turn the thermometer off.
2. Hold the HOLD key down while pressing the ON/ OFF key .
3. Unit will first display 8888 then the firmware ver­sion number
4. When the HOLD key is released, the unit will display 8888 and then turn off. (If field calibra­tion is already locked, the unit will return to mea­surement mode.)
.
.
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MAINTENANCE
Properly used, the thermometer should maintain calibration indefinitely and not require service other than occasional cleaning of the housing and chang­ing of the batteries.
Do not clean with abrasives or solvents. Use mild detergents, never immerse nor use e xcessive fluid.
BATTERIES
If there is no display when the thermometer is turned on, check condition of the two AA batteries. Also check that the battery terminals are clean and batteries are properly installed. If replacement is necessary, ref er to the BATTERY INSTALLATION AND REPLACEMENT section for replacement procedure.
SERVICE
There are no internal adjustments or user­replaceable parts.
Note: Serial number label is located inside battery compartment.
A-1925-37
Printed in Singapore
68X309902
13
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WARRANTY
The Manufacturer warrants this product to be free from significant deviations from published specifications. If repair or adjustment is neces­sary within the warranty period, the problem will be corrected at no charge if it is not due to mis­use or abuse on your part as determined by the Manufacturer. Repair costs outside the warranty period, or those resulting from product misuse or abuse, may be invoiced to you.
The product is supplied with a 3-year warranty.
PRODUCT RETURN
To limit charges and delays, contact the seller or Manufacturer for authorization and shipping in­structions before returning the product, either within or outside of the warranty period. When returning the product, please state the reason for the return. For your protection, pack the prod­uct carefully and insure it against possible dam­age or loss. Any damages resulting from im­proper packaging are your responsibility.
TECHNICAL ASSISTANCE
If you have any questions about the use of this product, contact the Manufacturer or authorized seller.
Trademarks bearing the ® symbol in this publication are registered in the U.S. and in other countries.
A-3477-71
68X309902
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Printed in Singapore
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Rev . 0
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