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1. REMEMBER SAFETY IS NO ACCIDENT C ENVIRONMENTAL Operating Temperature 0 to 40 C Storage Temperature 20 C to 60 C SPARES AND ACCESSORIES 7A501 Leads METDFKO0113 Carry Case 7AS01 METPA24249A Battery 1 5V IEC R6B CEJ0035 REPAIRS Martindale Electric Company LTD Metrohm House Penfold Trading Estate Imperial Way Watford WD24 4YY T 01923 441717 F 01923 446900 Email sales martindale electric co uk web www martindale electric co uk 7A501 SPECIFICATION A ELECTRICAL Insulation MQ Range Test Voltage Short Circuit Current Accuracy Continuity Q Range Test Voltage Short Circuit Current Accuracy Battery EMC 0 SOMQ 500V DC 10 across IMQ lt 2mA 1 6mm of scale arc length 0 50Q Nominal 200mV lt 26mA 1 6mm of scale arc length 6 off 1 5V AA IEC R6B Meets BS EN 50081 1 BS EN 50082 1 B MECHANICAL Size Material Weight Movement Scale Length Test Leads 132 X 82 X 60mm ABS 0 6kg Nominall 0mA sensitivity taut band 70mm 914mm long with crocodile clips GENERAL DESCRIPTION The 7A501 has been approved to BS1259 1958 and carries the Ministry of Power Certificate Number 181428 Class 1 and the Factory Inspectorate Certificate Number 2148 Class 2A and 2C which covers Methane Ammonia and Hydrocarbons Table 1 gives a full list of gases and vapours that are covered The testers have an analogue display and 500V D
2. voltage before touching it Turn off the power to a circuit before connecting test probes to it Be sure there is no voltage present before you touch the circuit Do not use cracked or broken test leads HIGH VOLTAGE IS DANGEROUS Always start with the power turned off Be sure these is no voltage present before making connections to the circuit Before disconnecting the tester turn the circuit off and wait for the meter to return to zero HAZARDOUS LOCATIONS In hazardous locations where inflammable gases may be present it is important to remember certain precautions must be taken These are 1 DONOT FLICK THE TEST LEADS 2 CONNECT TEST LEADS SECURELY TO CIRCUIT UNDER TEST 3 RELEASE OPERATING BUTTON BEFORE DISCONNECTING TEST LEADS NOTE BS1259 is now obsolescent and has been superseded by BS5501 Under BS1259 the tester by itself was approved whereas under BS5501 approvals also consider applications of the tester For example when carrying out insulation testing at 500V DC on wiring installations the inherent self capacitance of the wiring will charge up and could create an incendive spark if discharged accidentally It is necessary therefore to have a good working code of practice so that this hazard is eliminated and to ensure that the charge held in the wiring capacitance is discharged safely via the tester at the end of each insulation test THIS INSTRUMENT SHOULD ONLY BE USED BY A COMPETENT SUITABLY TRAINED PERSON
3. C insulation test voltage with a short circuit current of less than 2mA On continuity the test voltage is nominally 200mV with a short circuit current of 26mA maximum A special allen key is required to access the batteries so that they may not be changed in a hazardous area This tester does not comply with The ATEX directive 7A501 OPERATING INSTRUCTIONS TEST TERMINALS Fig 1 Front Layout of 7A501 The test switch is operated with a rocker button so that depressing and holding the left side measures continuity and depressing and holding the right side measures insulation Readings are displayed on an analogue meter If the pointer deflects upscale when the test leads are connected to a circuit it indicates that the circuit is live and operating the test switch could result in damage to the tester Disconnect the leads from the circuit Before using the tester check the pointer zero and the battery condition ZERO ADJUST If the pointer does not coincide with the zero on the left side of the scale adjust as required with a screwdriver inserted through the hole in the back of the case BATTERY TEST Connect the test terminals together with the test leads and operate the right MQ side of the test switch The pointer should read zero on the top MQ scale If not replace the batteries BATTERY REPLACEMENT The batteries must never be replaced in a hazardous area The carry case must first be removed by unscrewing the all
4. Martindale Electric Metrohm House Imperial Park Imperial Way Watford Hertfordshire WD24 4PP UK T 01923 441717 F 01923 446900 Email sales martindale electric co uk web www martindale electric co uk CMROO11 ISSUE 10 01 04 anMetrohm 7A501 EXTRA SAFE INSULATION amp CONTINUITY TESTERS INSTRUCTION MANUAL LIMITED WARRANTY Martindale Electric Company Ltd warrants instruments and test equipment manufactured by them to be free from defective material or factory workmanship and agree to repair or replace such products which under normal use and service disclose the defect to be the fault of our manufacturing with no charge for parts and service If we are unable to repair or replace the product we will make a refund of the purchase price Consult the Instruction Manual for instructions regarding the proper use and servicing of instruments and test equipment Our obligation under this warranty is limited to repairing replacing or making refund of any instrument or test equipment which proves to be defective within twenty four months from the date of original purchase This warranty does not apply to any of our products which have been repaired or altered by unauthorised persons in any Way so as in our sole judgement to injure their stability or reliability or which have been subject to misuse abuse misapplication negligence accident or which have had the serial numbers altered defaced or removed Accessories
5. en screw with the special key provided in the retaining strap To access the batteries remove the battery lid by undoing the screw at the rear of the tester with the special key Remove the spent batteries insert new ones and reassemble CONTINUITY 0 50Q Continuity resistance is displayed on the meter when the left side Q of the test switch is operated INSULATION 0 50MQ Insulation resistance is displayed on the meter when the right side MQ of the test switch is operated
6. itor high voltages turn off the power before connecting the tester Where possible do not touch the tester or its leads when the power is on Turn off the power before disconnecting the tester READ THE MANUAL Read this Instruction Manual carefully and completely Voltages within the capability of this tester can be hazardous Follow the instructions in this manual for every measurement Read and understand the general instructions before attempting to use this tester ii Compounds containing oxygen Oxides including ethers carbon monoxide methoxyethanol ethoxyethanol ethyldigol butyldigol dibutyl ether iii Compounds Containing Halogens Compounds without oxygen chloromethane chloroethane bromoethane chloropropane chlorobutane bromobutane dichloroethane dichloropropane chlorobenzene benzyl chloride dichlorobenzene allyl chloride dichloroethylene chloroethylene Compounds with oxygen acetyl chloride chloroethanol chlordimethyl ether Acids acetic acid ai CLASS GAS OR VAPOUR Esters methyl formate ethyl formate methyl acetate ethyl acetate butyl acetate amyl acetate methyl acetoacetate diethyl oxalate methyl acrylate ethyl acrylate iv Compounds Containing Nitrogen Amines methylamine dimethylamine trimethylamine diethylamine triethylamine propylamine butylamine cyclohexylamine ethanolamine diethylaminoethanol diaminoethane aniline dimethylaniline amphetamine toluidine p
7. not of our manufacture used with this product are not covered by this warranty To register a claim under the provisions of this warranty return the instrument or test equipment to Martindale Electric Company Ltd Metrohn House Penfold Trading Estate Imperial Way Watford Upon our receipt and inspection of the product we will advise you as to the disposition of your claim ALL WARRANTIES IMPLIED BY LAW ARE HEREBY LIMITED TO A PERIOD OF TWENTY FOUR MONTHS AND THE PROVISIONS OF THE WARRANTY ARE EXPRESSLY IN LIEU OF ANY OTHER WARRANTIES EXPRESSED OR IMPLIED The purchaser agrees to assume all liability for any damages and bodily injury which may result from the use or misuse of the product by the purchaser his employees or others and the remedies provided for in this warranty are expressly in lieu of any other liability Martindale Electric Company Ltd may have including incidental or consequential damages TABLE OF CONTENTS SAFETY RULES GENERAL DESCRIPTION 7A501 OPERATING INSTRUCTIONS 7A501 SPECIFICATION SPARES AND ACCESSORIES REPAIRS TABLE 1 LIMITED WARRANTY 10 11 12 SAFETY RULES crass 2c cont WARNING DISCONNECT TEST LEADS BEFORE OPENING TESTER This tester has been designed with your safety in mind However no design can completely protect against incorrect use Electrical circuits can be dangerous and or lethal when lack of caution or poor safety practices are used When using this tester to mon
8. yridine Amides formdimethylamide Nitro compounds nitromethane nitroethane nitrobenzene v Compounds Containing Sulphar ethyl mercaptan diethyl sulphate CLASS 2a 2c Methane firedamp Ammonia i Hydrocarbons Alkane methane industrial ethane propane butane pentane hexane heptane nonane cyclobutane cyclohexane methylcyclohexane decahydronaphthalene Benzenoid benzene toluene xylene ethylbenzene trimethyIbenzene aphthalene Alkene butene cyclohexene styrene di isobutylene Mixed Hydrocarbons turpentine coal tar naphtha petroleum naphtha kerosene CLASS GAS OR VAPOUR Alcohols and Phenols methanol ethanol propanol butanol pentanol hexanol octanol nonanol cyclohexanol methylcyclohexanol diacetone alcohol phenol cresol Aldehydes formaldehyde acetaldehyde octaldehyde paraformaldehyde paraldehyden metaldehyde benzaldehyde butyraldehyde Ketones acetone ethyl methyl ketone propyl methyl ketone butyl methyl ketone amyl methyl ketone acetylacetone cyclohexanone SAFETY CHECK Double check the switch setting and lead connections before making measurements Are you following instructions When changing the battery or removing the cover to access the internal circuitry always disconnect the test leads DON T TOUCH Don t touch exposed wiring connections or other live parts of an electrical circuit If in doubt check the circuit first for

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