Manual - Martindale Electric
Contents
1. When in the maximum reading function pressing the HOLD button will stop the update Press HOLD again to resume updating Press the MAX button to exit the maximum reading function 3 8 Data Hold To hold a displayed reading press the HOLD button The LCD displays the D H symbol To exit data hold press the HOLD button 3 9 Temperature Measurement Connect a Type K thermocouple probe suitable for the type of temperature measurement and temperature range being made to the thermocouple input socket T1 or T2 or both on the DT75 For the DT75 only press either the T1 or T2 button to select the thermocouple input to be displayed The LCD displays the or symbol according to the input selection Taking all necessary safety precautions position the thermocouple at the surface to be measured and read the measured temperature from the display Note Repeated flexing can break the thermocouple leads To prolong lead life avoid sharp bends in the leads especially near the connector 4 MAINTENANCE 4 1 Battery Replacement A To avoid shock or injury disconnect the thermocouple s from any external surface and remove before proceeding Using a Phillips screwdriver remove the three screws from the back of the meter and lift off the front cover Replace the battery with a new standard 9V battery PP3 NEDA 1604 or equivalent observing correct polarity NOTE It is essential to transfer the protective insulating sleeve from t2. 50 C to 1300 C 58 F to 2000 F The DT73 and DT75 have maximum reading and data hold functions The DT75 is dual input and may be used in differential mode when thermocouples are connected to both inputs 1 3 Accessories included The DT73 and DT75 come with the following accessories Rubberised holster TT1P type K thermocouple probe x2 for DT75 e Velcro strap 9V battery installed Instructions 1 4 Battery Installation Refer to Section 4 1 Battery Replacement for the battery installation instructions for the DT73 and DT75 2 PRODUCT SPECIFIC SAFETY INFORMATION Test Equipment Without A Rated Measurement Category is applicable to testing and measurement of circuits not connected directly to the MAINS supply If test and measurement equipment does not have a CAT marking then it should be regarded as a maximum of 50V rating unless otherwise specified 2 1 Precautions This product has been designed with your safety in mind but please pay attention to the following warnings and cautions before use warning This unit must NOT be connected to CAT Il CAT III or CAT IV circuits A warning Before use check the unit for cracks or any other damage Make sure the unit is free from dust grease and moisture Also check any associated leads and accessories for damage Do not use if damaged A warning Do not use if the battery fuse cover is not fitted warning To avoid electrical shock and da
3. batteries test leads or to any product which in Martindale s opinion has been misused altered neglected contaminated or damaged by accident or abnormal conditions of operation handling or storage Martindale authorised resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Martindale Martindale s warranty obligation is limited at Martindale s option to refund of the purchase price free of charge repair or replacement of a defective product which is returned to Martindale within the warranty period This warranty is the buyers sole and exclusive remedy and is in lieu of all other warranties expressed or implied including but not limited to any implied warranty of merchantability or fitness for a particular purpose Martindale shall not be liable for any special indirect incidental or consequential damages or losses including loss of data arising from any cause or theory Since some jurisdictions do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages the limitations and exclusions of this warranty may not apply to every buyer If any part of any provision of this warranty is held invalid or unenforceable by a court or other decision maker of competent jurisdiction such holding will not affect the validity or enforceability of any other provisi
4. 173 D175 Digital Thermometer All specified accuracies are at 23 C 5 C lt 75 RH for 1 year not including thermocouple error Temperature coefficient 0 1 x specified accuracy per C 0 C to 18 C 28 C to 50 C Temperature scale Celsius or Fahrenheit user selectable Thermocouple type K Measurement range 50 C to 1300 C 58 F to 2000 F Note Measurement range will be limited by the range of the thermocouple probe used Resolution 0 1 to 199 9 C F 1 gt 200 C F Temperature accuracy DT73 50 C to 1000 C 1000 C to 1300 C 58 F to 2000 F 50 C to 0 C 0 C to 1000 C 1000 C to 1300 C 58 F to 32 F 32 F to 2000 F 0 3 of rdg 1 C 0 5 of rdg 1 C 0 3 of rdg 2 F 2 C 0 3 of rdg 1 C 0 5 of rdg 1 C 4 F 0 3 of rdg 2 F Check out what else you can get from Martindale 17th Edition Testers Accessories Calibration Equipment Continuity Testers Electricians Kits Environmental Products Full Calibration amp Repair Service Fuse Finders Digital Clamp Meters Digital Multimeters Labels Microwave Leakage Detectors Motor Maintenance Equipment Multifunction Testers Non trip Loop Testers Pat Testers amp Accessories Phase Rotation Testers Proving Units Socket Testers Thermometers amp Probes Test Leads Voltage Indicators Specialis
5. DT73 DT75 DIGITAL THERMOMETER INSTRUCTION MANUAL MARTINDALE MARTINDALE PEEECTAIC Thank you for buying one of our products For safety and full understanding of its benefits please read this manual before use Technical support is available from 01923 441717 and support martindale electric co uk CONTENTS Introduction Inspection Description Accessories Battery Installation Product Specific Safety Information Precautions Operation General Low Battery Indication Description of Press Buttons Description of LCD Symbols Temperature Scale Selection Display Resolution Selection MAX Function Data Hold Temperature Measurement Differential Temperature Measurement Temperature Offset Adjustment Maintenance Battery Replacement Calibration Cleaning Repair amp Service Storage Conditions Warranty Specifications OO O WO MA ONNDWWOOAAATRWWAWNHN H a aoaaa A GENERAL SAFETY INFORMATION Always read before proceeding Warning These instructions contain both information and warnings that are necessary for the safe operation and maintenance of this product It is recommended that you read the instructions carefully and ensure that the contents are fully understood Failure to understand and to comply with the warnings and instructions can result in serious injury damage or even death In order to avoid the danger of electrical shock it is important that proper safety measures are taken when working w
6. ence temperature Allow the readings to stabilize Slowly adjust the OFFSET so that the thermometer reading matches the temperature of the known environment Leave sufficient time between adjustments to allow for measurement lag The calibration of the thermometer thermocouple combination is now optimized for measurements at the reference temperature The factory setting for the offset adjustment is 0 0 C 32 0 F 4 4 Repair amp Service There are no user serviceable parts in this unit other than those that may be described in section 3 Return to Martindale Electric if faulty Our service department will quote promptly to repair any fault that occurs outside the guarantee period Before the unit is returned please ensure that you have checked the unit batteries fuses poor connections and leads 4 5 Storage Conditions The instrument should be kept in warm dry conditions away from direct sources of heat or sunlight and in such a manner as to preserve the working life of the unit It is strongly advised that the unit is not kept in a tool box where other tools may damage it 5 WARRANTY AND LIMITATION OF LIABILITY This Martindale product is warranted to be free from defects in material and workmanship under normal use and service The warranty period is 2 years and begins on the date of receipt by the end user This warranty extends only to the original buyer or end user customer and does not apply to fuses disposable
7. he old battery to the new battery Replace the front cover and re install the screws 4 2 Calibration To maintain the integrity of measurements made using your instrument Martindale Electric recommends that it is returned at least once a year to an approved Calibration Laboratory for recalibration and certification Martindale Electric is pleased to offer you this service Please contact our Service Department for details Email service martindale electric co uk Tel 01923 650660 4 3 Cleaning The unit may be cleaned using a soft dry cloth Do not use moisture abrasives solvents or detergents which can be conductive 3 10 Differential Temperature Measurement DT75 Only Connect Type K thermocouple probes suitable for the type of temperature measurement and temperature range being made to the thermocouple input sockets T1 and T2 Taking all necessary safety precautions position the thermocouples at the surfaces to be measured Press the T1 T2 button The LCD displays the T1 T2 symbol The difference between the measured temperatures of thermocouples T1 and T2 will be displayed 3 11 Temperature Offset Adjustment The offset adjustment allows an individual Type K thermocouple to be optimised for the best measurement accuracy at a chosen reference temperature Connect the thermocouple to the input socket and select 0 1 display resolution Place the thermocouple in a known stable temperature environment at the refer
8. ith voltages exceeding 30V AC rms 42V AC peak or 60V DC This product must only be used by a competent person capable of interpreting the results under the conditions and for the purposes for which it has been constructed Particular attention should be paid to the Warnings Precautions and Technical Specifications Always check the unit is in good working order before use and that there are no signs of damage to it Do not use if damaged Where applicable other safety measures such as use of protective gloves goggles etc should be employed Please keep these instructions for future reference Updated instructions and product information are available at www martindale electric co uk REMEMBER SAFETY IS NO ACCIDENT MEANING OF SYMBOLS Equipment complies with relevant EU Directives Caution risk of danger amp refer to instructions Caution risk of electric shock Equipment protected by double or reinforced insulation Class Il End of life disposal of this equipment should be in accordance with relevant EU Directives Direct current DC Alternating current AC Earth ground 1 INTRODUCTION 1 1 Inspection Examine the shipping carton for any sign of damage Inspect the unit and any accessories for damage If there is any damage then consult your distributor immediately 1 2 Description The DT73 and DT75 are portable 312 digit compact thermometers for use with Type K thermocouples The measuring range is from
9. mage to the instrument do not use this instrument and the associated temperature probe when voltages at the measurement surface exceed 24V AC rms or 60V DC A Caution To avoid burns or damage to equipment do not take temperature measurements inside microwave ovens A Caution Avoid severe mechanical shock or vibration and extreme temperature 3 3 Description of Press Buttons T2 ELA Tr a 60V 60V 60V 24V OFFSET 24V OFFSET OFFSET 24V MAX M DT75 Powers up the DT73 ON OFF Powers up down the DT75 Powers down the DT73 F C Selects the Celsius Fahrenheit Selects deselects the temperature scales maximum reading function MAX Selects deselects the Selects deselects the data maximum reading function hold function HOLD Selects deselects the data Selects 0 1 resolution hold function Selects 1 resolution 0 1 1 Selects 0 1 1 resolution Selects the Celsius T1 Selects thermocouple T1 input temperature scale T2 Selects thermocouple T2 input Selects the Fahrenheit Selects differential input mode temperature scale 3 OPERATION 3 1 General If the thermometer displays OL then the measurement limits of the range have been exceeded A the maximum temperature measurement of the DT73 DT75 is 1300 C 2000 F but the thermocouple probe being used may be specified to a lower temperature For example the TT1P supplied is specified to 260 C 500 F Be sure that the thermocouple probe is adequa
10. on or other part of that provision 10 Nothing in this statement reduces your statutory rights Specification Meher D173 DT75 Digital Thermometer Input protection 60V DC or 24V AC rms maximum input voltage on any combination of input pins Input connector Accepts standard miniature thermocouple connectors flat blades spaced 7 9mm center to center TT1P thermocouple probe 4 foot Type K thermocouple bead probe teflon tape insulated Maximum insulation temperature 260 C 500 F Probe accuracy 2 2 C or 0 75 of reading whichever is greater GENERAL Display 3 digit liquid crystal display LCD with maximum reading of 1999 Reading rate 2 5 times per second Ambient operating range 0 C to 50 C 32 F to 122 F Storage temperature 20 C to 60 C 4 F to 140 F Relative humidity 0 to 80 0 C to 35 C 32 F to 95 F 0 to 70 35 C to 50 C 95 F to 122 F Power Single standard 9V battery PP3 NEDA 1604 or equivalent Battery life 200 hours typical with carbon zinc battery Dimensions 147 mm H x 70 mm W x 39 mm D Weight Approx 210g including battery Approx 337g including battery and holster Includes Rubberised holster TT1P Type K thermocouple probe x2 for DT75 Velcro strap 9V battery installed and instructions SAFETY BS EN 61010 1 50V Class Il Double Insulation Pollution Degree 2 EMC Conforms to BS EN 61326 1 MARTINDALE ELECTRIC Specification D
11. t Metrohm Testers 4 amp 5kV Specialist Drummond Testers Martindale Electric Company Limited Metrohm House Penfold Trading Estate Imperial Way Watford WD24 4YY UK Tel 44 0 1923 441717 Fax 44 0 1923 446900 E mail sales martindale electric co uk Website www martindale electric co uk 2012 Martindale Electric Company Ltd Registered in England No 3387451 E amp O E Document Rev1 LITDT73 75
12. te for the measurement being made 3 2 Low Battery Indication If the symbol is displayed then the battery needs replacing see section 4 1 Battery Replacement 3 4 Description of LCD Symbols MAX Maximum reading function is selected Thermocouple T1 input is selected DT75 only Thermocouple T2 input is selected DT75 only SES Differential input mode is selected DT75 only Degrees Celsius temperature scale is selected Degrees Fahrenheit temperature scale is selected Indicates battery is low hold function is selected 3 5 Temperature Scale Selection Readings are displayed in either degrees Celsius C or degrees Fahrenheit F To select the Fahrenheit F scale press the F DT73 F C DT75 button The LCD displays the F symbol To select the Celsius C scale press the C DT73 F C DT75 button The LCD displays the C symbol On power up the instrument defaults to the scale last selected before power down 3 6 Display Resolution Selection The display resolution can be set to 0 1 or 1 below 200 0 C F Above 199 9 C F OL will be displayed if 0 1 resolution is selected To select 1 resolution press the 1 DT73 0 1 1 DT75 button To select 0 1 resolution press the 0 1 DT73 0 1 1 DT75 button 3 7 MAX Function Press the MAX button to activate the maximum reading function The latest maximum reading will be continually updated and displayed The LCD displays the MAX symbol
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