The 7a501c safety insulation tester meets BS1259 standards and has been certified for use in hazardous environments with specific electrical specifications. It features a 500V DC insulation test voltage and a special design that restricts battery access for safety. The document also notes that BS1259 has become obsolescent, superseded by BS5501, which affects the approval criteria.

1. 7A501C safety
insulation tester
The 7A501 has been approved to BS1259 (1958) and
carries the Ministry of Power Certificate Number IS1428
(Class 1)and the Factory Inspectorate Certificate Number
2148 (Class 2A and 2C) which covers Methane, Ammonia
and Hydrocarbons.
The testers have an analogue display and 500V DC
insulation test voltage with a short circuit current of less
SPECIFICATIONS
ELECTRICAL
INSULATION MΩ
Range: 0 - 50M.
Test Voltage: 500V DC±10% across 1MΩ
Short Circuit Current: <2mA
Accuracy: ±1.6mm of scale arc length
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 ATEX94 directive.
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superseded by BS5501.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.
CONTINUITY Ω
Range: 0 - 50.
Test Voltage: Nominal 200mV
Short Circuit Current: <26mA
Accuracy: ±1.6mm of scale arc length
Battery: 6 off 1.5V AA IEC R6B
MECHANICAL
Size: 132 X 82 X 60mm
Material: ABS
Weight: 0.6kg
Movement: Nominal 1.5mA sensitivity - taut band
Scale Length: 70mm
Test Leads: 1m long with crocodile clips
ENVIRONMENTAL
Operating Temperature: 0 to 40°C
Storage Temperature: -20°C to 60°C
Due to policy of continuous development, Martindale Electric reserves the right to alter equipment specification and description outlined in this document without prior notice. No part of
this document shall be deemed to be part of any contract for the equipment unless specifically referred to as an inclusion within such contract.
© Martindale Electric Co. Ltd. 2005
Martindale Electric Company Ltd.
Metrohm House, Penfold Trading Estate, Imperial Way, Watford, Tel: +44 (0)191 490 1547 01923 441717 Fax: 01923 446900
WD24 4YY. Tel:
Fax: +44 (0)191 477 5371
Email: northernsales@thorneandderrick.co.uk
E-mail: sales@martindale-electric.co.uk Web site: http://www.martindale-electric.co.uk rev2
Website: www.cablejoints.co.uk
www.thorneanderrick.co.uk