Grant Instruments Labwise - Manual (Page 16)

May 2012 Page 16 30853(1)
4.3.1.2. Extension
The Extension is a time period in addition to the Duration. A segment with an Extension
period set will remain active (e.g. heating) until the temperature is achieved OR the
Extension period ends. This is useful if the controller cannot reach the Target Temp within
the Duration period. The program enters a hold mode until the Target Temp is reached
when the program will then proceed with the next segment. If the Target Temp is still not
reached after the Extension period then the program will proceed as if the Target Temp has
been reached. The Extension time is entered in the same way as for Duration.
4.3.1.3.
Relay operation
If relay operation is required, e.g. for switching a cooler on/off, select Relay 1 and/or Relay 2
(GP200 only). The relay output is via the connectors on the back of the control unit. Relay
operation may be set individually for each program segment.
4.3.1.4.
Loops
A selected segment or group of segments may be repeated within the program using the
Loop To function. The final segment of the sequence to be repeated should be selected, the
Loop To value then set to be the segment number that forms the first segment of the loop.
The Loop Repeats set the number of times the loop should be repeated. A loop is identified
on the programming screen as a green arc linking the selected program segments. The
number of loop repeats is also indicated on the arc. Nested loops are possible but should be
programmed and tested to ensure the temperature changes as expected.