Circulators - Grant Iinstruments (Cambridge Ltd) - General Information - Used Laboratory Equipment and New Lab Instrument Supplies, UK

Circulators - Grant Iinstruments (Cambridge Ltd) - General Information

Safety
All Grant circulators meet the requirements of International Standard IEC 61010-1, Safety requirements for electrical equipment for measurement, control, and laboratory use and IEC 61010-2-010, Particular requirements for laboratory equipment for the heating of materials.

The above international standards are also published as European (EN 61010) and British (BS EN 61010).

All plastics used on the circulators are resistant to acids and to common laboratory solvents, and meet classification FV0 or FV1 of IEC 707 (equivalent to V-0 or V-1 of UL94).

Electrical supplies
All standard circulatorsare available for voltages within the range 220-240V, 50 or 60 Hz, apart from RC recirculating chillers which may only be used on 50 Hz supplies. Most standard equipment is available for voltages within the range 110-120V, 50 or 60 Hz. See specification tables for details.

Environmental conditions
Circulators are designed for indoor use in laboratory conditions, with room temperature between 5C and 40C, and 80% relative humidity up to 31C unless stated otherwise.

CE mark
All Grant laboratory equipment bears a CE mark to indicate that it meets the requirements of all applicable European Directives.

Compliance with the Low Voltage Directive is demonstrated by meeting EN 61010 (see paragraph above on safety) and the EMC Directive by meeting EN 61326-1: EMC requirements for electrical equipment for measurement, control and laboratory use.

Where appropriate Grant laboratory equipment conforms to IEC 61326-1 (EN 61326-1) Class B except where indicated.

Class B equipment is for use in domestic establishments, and in establishments directly connected to a low voltage power supply network which supplies buildings used for domestic purposes.

Class A equipment is suitable for use in establishments other than domestic, and those directly connected to a low voltage power supply network, which supplies buildings used for domestic purposes.

International quality standards
Grant Instruments (Cambridge) Ltd. operates an approved Quality Management System which complies with the requirements of BS EN ISO 9001:2000 for the activities detailed in the scope of registration. Certificate No. FM 24301.

After sales service
In the United Kingdom, repairs are normally carried out within two to five working days of arrival at our factory, or receipt of authorisation to repair. Refrigeration systems may take a few days longer, as they require more prolonged testing after repair. Alternatively, spare parts and service manuals can normally be despatched within two working days.

Most distributors of Grant equipment outside the UK hold stocks of spare parts, have their own service engineers and operate a similarly prompt repair service.

Guarantee
Grant equipment is robust and reliable, designed and built to provide years of trouble-free service.

All standard Grant laboratory equipment is guaranteed for three years against faulty materials and workmanship. Grant/Boekel equipment is guaranteed for two years.

If repairs are carried out under guarantee, no charge is made for labour or materials, and within the United Kingdom we make no charge for carriage.

Performance figures
Except for refrigerated products, performance figures quoted apply to equipment used in ambient temperature between 10C and 35C. See specification tables for details.

Stability figures quoted for baths/circulators are derived from tests made in accordance with DIN 58966. The DIN test specification requires measurements to be taken as follows:

• At one point in the middle of the bath
• At one temperature
• During '100 fluctuations'
• Without any test tubes or flasks in the baths
• Stable ambient temperature
• Stable supply voltage

Performance figures are then calculated ignoring the worst 25% of all temperature fluctuations.

The measurement procedure for stability of block heaters is similar, with measurements taken in the centre of a block.

Uniformity is measured at 37C, using water in a bath, unless stated otherwise. Uniformity is defined as half the maximum temperature difference between any two points in the working space of a bath, or between any two tubes in a block heater.

Liquids
We recommend the following liquids for use in Grant baths:

-50 to 50C:
Silicone fluid: Bayer Baysilone M3

-30 to 30C:
50% water 50% antifreeze
(inhibited ethylene glycol)

0 to 30C:
80% water 20% antifreeze
(inhibited ethylene glycol)

5 to 99.9C:
water

50 to 150C:
Dow Corning silicone fluid DC200/20

150 to 260C:
Dow Corning silicone fluid DC210H/100

As Grant Instruments is committed to a continuous programme of improvement, specifications may be changed without notice.