Operating Procedures; Operation; Liquid Level; Operation Above 60°C - Grant Optima TX150 Manual Del Operador

5.0

Operating procedures

5.1

Operation

5.1.1 Liquid level

The minimum and maximum liquid levels are defined in section 6.4 for Grant accessory
baths. Liquid level should always be maintained between these levels. These levels
apply both when there are no vessels in the bath and with the maximum contents. If
using liquids that can evaporate then periodic checking and refilling should be completed.
The low level float switch will alarm if the liquid level drops below the minimum required
level and the unit will switch off the heater and stop temperature control.
5.1.2 Operation above 60°C
A lid or polypropylene spheres must be used above 60°C to maintain temperature control
and to ensure that the bath fluid temperature reaches the set point. They will save
energy by preventing excessive evaporation and reduce the frequency that the bath
needs to be refilled. As a precaution, the TX150/TXF200 may display 'Overheating-
power reduced' if heating water at or near boiling over extended periods or heating large
volumes of liquid with large thermal losses without the use of a lid or polypropylene
spheres. In this event the heating power is reduced by 50%. See section 11 for
additional guidance.
Care should be taken to ensure rear inlet vents are clear and minimise the intake of
steam or fumes when operating at or near water boiling or with other evaporating liquid.
Take care when lifting and removing the lid as it may be hot. Steam and hot
vapours can cause scalding.

5.1.3 Operation at low temperatures

Accessory cooling is required for controlled operation at or below ambient temperature.
The minimum working temperature without accessory cooling depends on the size of the
bath. The small baths, P5 and ST5, have a minimum working temperature of
approximately 10°C above ambient without a lid and 15°C above ambient with a lid.
Other bath sizes can be used at a temperature of 5°C above ambient.

5.1.4 Using the pump

The TX150/TXF200 allows liquid to be pumped around a closed external system (not
open to the atmosphere). It may be used for circulation through an external open tank
only if a gravity feed return is present. An assessment of any open system should be
completed to ensure liquid levels are stable during operation and there is no chance of
any reservoir running dry or overflowing. The pump is fitted with a blanking plate as
standard. Fit a pump connector plate as shown below. Note: the blanking/connector
plates have a locating hole (see A below) to assist correct alignment onto the pump
moulding. It is important to verify the hole is aligned with the corresponding locating pin
(see B below) on the pump moulding. Failure to do so will result in a leaking connection.
Retain the blanking plate for refitting when the pump is no longer required.
TX150 & TXF200
Operating Manual
www.grantinstruments.com
EN
30424 V6
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