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screwdriver, until the alarm lamp comes on. Allow the bath to cool, then press the reset button
and the unit will start. (Bath will have to cool by 15 to 30 degrees before the reset will work).
This gives an overtemperature trip point of the set value. Now decrease the set temperature to
the working set point.
3.1.8. Function control "F"
Press "F" to enter function select mode (see 3.4 Function and program setting).
3.1.9. Input/output connections
Relay 1
External probe - jack socket to take Grant part FF17 or LL17
RS232 - 9 pin D type connector for computer interfacing. (See Grant Labwise).
Relay 1 (and relay 2, GP200) Three pin connector, internal relay change over contacts, rated 230V 2A
Relay pin connections (Relay in OFF position)
Pin 1 Normally Closed - N/C
Pin 2 Common
Pin 3 Normally Open - N/O
3.1.10. Connector for Relays Assembly diagram
Caution:
Use correct size cable with correct class of insulation for the voltage and current being
switched. Where mains voltage is to be switched through the relay, ensure that it is from the
same phase as that which goes to the unit so that voltage limits are not exceeded. Where any
doubt exists, consult a competent person.
Relay switching specification 230v, 2A
Maximum outside diameter of cable - 6mm
17091 Version 12 - October 2009 75T
Page 9
Rear Panel
External
probe
Note: Only use RS232 cables provided by Grant Instruments
- C
www.grant.co.uk
RS232
Relay 2
GR150, GP200
Operating Manual
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