R Series
30934 V2
Operating Manual
Page 8
www.grantinstruments.com
5.0 Operating procedures
5.1
Operation
5.1.1 Liquid level
Fill the tank to an appropriate level with a liquid suitable for your working temperature;
see section 4.3 for liquid options. Allow for thermal expansion and contraction of the
liquid during operation and for any liquid in external circulation paths. 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.
Take care when lifting and removing the lid as it may be hot. Steam and hot
vapours can cause scalding.
5.1.3 Using the control unit pump
The Optima unit allows liquid to be pumped around a closed external system (not open to
the atmosphere). It cannot be used for circulation through an external open tank. The
pump is fitted with a blanking plate as standard. Fit a pump connector plate as shown
below. Ensure o-rings are located in the grooves, use silicone grease to hold the o-rings
in place. 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.
Always use pump connectors and hoses that are suitable for the operating
temperature and liquid used. Check the pipe connections are secure.
Never disconnect any pipes or hoses while they contain very hot or very cold
liquids or while the Optima unit is pumping.
Never use silicone oil with silicone tubing.
B
A