Grant GR150 Manual De Operación página 27

Heat up time in minutes from 25C to 70C with water and lid on:-
S5
S12
S18
S26
S38
6. Maintenance
All Grant laboratory products are designed to comply with IEC61010-1 and can be flash
tested. Some are fitted with radio frequency interference suppressors. Therefore it is
recommended that only a d.c. test is performed.
The overtemperature cut-out should be checked periodically by turning the set
overtemperature control with a screwdriver anticlockwise until the alarm lamp comes on. The
cut-out should then reset and set-up (see 3.1.3). If the alarm lamp fails to light with the knob
fully turned anticlockwise the unit should be checked by a competent person.
The liquid level protection should also be checked periodically by lowering the level of liquid in
the bath and noting that the unit cuts out with the top turn of the heater still immersed in the
liquid.
When hoses are fitted to the pump they should be inspected periodically and replaced as
necessary to avoid hose failure.
No other routine maintenance is required.
6.1. Cleaning
The cases can be cleaned with a damp cloth after disconnection. Do not use solvents. The
immersed parts can be cleaned using proprietary heating element cleaners. CAUTION: these
may be toxic - follow the cleaner manufacturer‟s instructions.
Before using any decontamination or cleaning method except that recommended, check with
our Service Department or in other countries with our distributor, that the proposed method will
not damage the equipment.
6.2. Replacement of fuses
230v
Disconnect the unit from the power supply socket. Remove the IEC power plug from the rear
of the unit. Press down the drawer catch Pull out the fuse drawer, check and replace with the
correct fuses if necessary, as follows:
Push back the drawer and replace the IEC plug.
120v
Disconnect the unit from power supply socket.
Locate fuses on rear panel next to power cable inlet.
Use screwdriver of correct size to turn fuse holder a quarter turn anti-clockwise to release fuse
holder.
Check, replace with correct fuses if necessary.
The fuses (Two off) should be:
Replace fuse holder.
17091 Version 12 - October 2009 75T
Page 25
230V 120V
10 16
25 35
38 53
50 70
70 100
Two off, 1.25 x 0.25 inch ceramic quick acting rated:-
250V: 10AF
1.25 x 0.25 inch ceramic quick acting rated:-
250v 20AF
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GR150, GP200
Operating Manual