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...6 PROGRAMMING
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
, 0 to 1 kΩ in 0.01 Ω increments.
†
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.
24
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.
Proportional Band
2
The proportional band is adjustable between 1 and 500% in 1% increments.
Advance to next parameter.
Integral Action Time
200
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.
•
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.
decade box
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