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6.2.9 Set Up Temperature Control Page
The parameters within this page are factory preset and should not require any adjustment.
SET UP TEMP. CONTROL
Cycle Time
Prop. Band
Integral Time
or
CALIBRATION
6.2.10 Electrical Calibration
Electrical calibration is carried out prior to despatch and should
require no subsequent adjustment. However, if measurements
become suspect or if the contents of the 'CALIBRATION' page are
inadvertently altered, recalibrate as detailed in the following
sections.
Note. The calibration procedure involves modifying part of the
original programme but, provided that changed values are
not stored using the 'Enter' switch, the original
programme, which was stored in the nonvolatile memory, can
easily be reinstated at the end of calibration by switching off
the instrument and switch on again.
If there is thought to be any risk that the original programme could
be lost, it is advisable to make a note of the normal parameter
settings. If the changed programme values are inadvertently
'Entered', the instrument can be reprogrammed on completion of
the calibration procedure.
Equipment Required
•
Millivolt source, range –400 to +400 mV.
•
Electrode coaxial plug/lead assembly – supplied with
monitor;
•
Decade resistance box
†
Resistance boxes have an inherent residual resistance
which may range from a few milliohms to one ohm. This value
must be taken into account when simulating input levels, as
must the overall tolerances of the resistors within the box.
Page header.
Advance to next parameter.
Cycle Time
20
The cycle time is adjustable between 5 and 60 seconds in 1 second increments.
Advance to next parameter.
5
Proportional Band
The proportional band is adjustable between 1 and 500% in 1% increments.
Advance to next parameter.
200
Integral Action Time
The integral action time is adjustable between 1 and 1800 seconds in 1 second
increments (1801 = 'OFF').
Return to top of Set Up Temperature Control Page.
or
Advance to Calibration Page.
†
, 0 to 1 k in 0.01
increments.
•
Digital milliammeter, 0 to 20 mA – refer to Fig. 2.4 to
identify the output range.
Preparation
a) Switch off the supply and disconnect the temperature sensor
leads from terminals 1, 2 and 3 in the Microprocessor Unit.
Make the following connections:
1 & 3 (temperature sensor)
2 (temperature sensor)
b) Insert the coaxial plug into the ISE socket above the flowcell
and connect the millivolt source (inner +ve, outer –ve).
c) Connect the milliammeter in place of the appropriate current
output connections in the junction box – see Section 2.6.
d) Switch on the supply and allow two minutes (30 minutes from
cold) for the circuits to stabilise.
e) Select the appropriate Cal User Code to gain access to the
programming pages – see Section 6.2.8.
6 PROGRAMMING...
decade box
25
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