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18-5-10
TCH-150 & 460
ELECTRICAL - POWER LEAD
Model TCH-150:
A mains power lead with a three pin plug and right angle IEC socket is supplied
for connection between the male IEC socket located on the side of the cabinet and a 10 amp
general purpose outlet (power point).
Model TCH-460:
A mains power lead with a three pin 15 amp plug is supplied for connection to a
15 amp general purpose outlet (power point). Note that an outlet with this current rating in Australia
has a large earth pin.
OPERATING THE CABINET:
1) Ensure that the chamber is located as previously described, refer to the index, LOCATION,
Page 5. Connect the water supply, drain pipe, and electrical power as previously described.
Turn on the water supply.
Turn on the mains power at the power point.
2) Loading/Unloading the Chamber
Load Distribution
There is a direct relationship between the temperature/humidity uniformity throughout the
workspace and the air distribution.
If the air can not freely circulate, then the controlled conditions can not be maintained.
Product under evaluation should be distributed as evenly as possible across each shelf
level, so that air flow is not impeded.
3) Door Opening
When the door is open, the controlled conditions will begin to deteriorate. To minimise
losses always close the doors as soon as practical. Should the door be opened for a long
time, then the control may extend the time to return to the set conditions beyond that
normally expected. Note: a door switch turns off the fan and heating elements when the
door is open.
4) Position the mains switch to the
ON
position (reset) and immediately both controllers will go
through a short initiation period, the two displays will then indicate the operating value at
the top display and the set value at the lower display. Note: The Humidity switch has to be
“on” for the humidity control to work. If there is no digital display on the humidity control the
humidity switch is turned off. The main switch will be illuminated when turned on.
5) The water level in the trough inside the cabinet is controlled automatically by a float switch
that turns a solenoid valve on or off as the water level rises and falls. The humidity switch
has to be on for the water to flow.
The humidity element will not operate until the water in the trough covers the element. If
town water is used as a water supply the high water pressure may cause the float switch to
“bounce”. This will result in the solenoid valve rapidly clicking on and off with the float
switch. If this occurs you may need to adjust the water pressure regulator (see page 19 for
details on how to do this).
6) If humidity control is not required, turn the humidity switch off. The humidity control will have
no display.
Tip!
When operating at elevated temperatures, start off by leaving the humidity switch in
the “off” position. Allow time for the temperature to stabilise before turning on the humidity
switch. This will reduce condensation on the walls and reduce water consumption.
7) The controllers are Eurotherm 3216 microprocessor based instruments which have been
factory configured for range, sensor type, and engineering parameters for optimum control.
Summary of Contents for TCH-150
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