Low temperature refrigerated circulating baths - technical specifications
Grant Optima™ circulator
	Digital
	TC120
Stability (DIN 12876) water @ 10°C °C	± 0.1
-10°C for 50% water, 50% glycol °C	± 0.1
Uniformity (DIN 12876) water @ 10°C °C	± 0.1
-10°C for 50% water, 50% glycol °C	± 0.1
Setting resolution °C	0.1
Display	4 digit LED
Timer function	1 min to 99 hrs 59 mins
No. stored temperature values	3
Two point re-calibration
Safety overtemperature	adjustable cut-out
fluid level - float switch
High alarm	yes
Heater power 230 V kW	1.3
120 V kW	1.4
Electrical power 230 V kW	1.4 (50 Hz)
120 V kW	1.5 (50-60 Hz)
Height above tank rim mm	200
Depth below tank rim mm	135
Grant Optima™ thermostat pumps (integral)
Maximum pressure water mbar	210
Maximum flow water L/min	16
Pipe boreinlet/outlet mm	6, 11

R series refrigeration units - models and specifications
Grant Optima™ circulators
= standard	R2
Relay control (refrigeration on/off)
Refrigerant	R134a
Drain
Overtemperature cut -out 100°C limit
Water freezing protection thermostat
Refrigeration high pressure switch 27 bar	-
Cooling power**, ambient 20°C  @ 20°C  W	340
@ 0°C  W	140
@ - 10°C  W	100
@ - 20°C  W	35
@ - 30°C  W	-
@ - 40°C  W	-
@ - 47°C  W	-
Electrical power (maximum)  230V  W	334 (50 Hz)*
120V  W	328 (50 Hz)*
EMC emissions  class	B

* Optima™ circulator and accessory pumps can be powered from the back of the R2 220-240 V refrigeration units. Allow up to 2 kW of extra power from the electrical supply
** The optional VTP pumps will transfer additional heat to the baths and reduce the net cooling power of the refrigeration unit. The above figures must be taken into consideration when choosing the refrigeration unit
Note: when ordering a VTP pump, please specify which refrigeration base unit it is to be used with

Grant case study:  Department of Chemistry, Imperial College London.

Product range: Grant Optima LTC refrigerated baths and circulators

Background
The Department of Chemistry at Imperial College London is one of the largest chemistry departments in the UK and has a world-class reputation for both teaching and research.  The Department employs over 50 academic staff, many internationally renowned in their respective fields, four Fellows of the Royal Society, 23 academic visitors, 49 postdoctoral fellows and 193 postgraduate students.  It has five research groups covering catalysts and advanced materials, chemical biology, chemical physics, nanostructures materials and devices and synthesis. 

Application
The Department of Chemistry’s busy undergraduate teaching labs contacted Grant Instruments to discuss potential solutions for controlling the temperature of the numerous condensers used for routine experiments.  Condensers in the lab are often used for up to 8 hours a day and sometimes overnight to allow experiments to run to completion.  In the past the Department had relied on mains water cooling of condensers, but were keen to switch to a method which minimised water consumption, removed the risk of flooding and provided more consistent temperature control.

The Grant Optima LTC refrigerated circulator solution
Grant Instruments supplied a total of ten Optima refrigerated circulating baths (product name - LTC) for the temperature control of condensers in the teaching lab.  Grant Optima LTC units are supplied as a ready to use system with insulated tubing and clips included, making it simple to attach to the condenser set-up. 

Teaching lab technicians soon discovered the LTC could be used to circulate temperature controlled fluid to up to three condensers and one starfish condenser with five branches. The LTC also provided temperature stability and uniformity which could not be achieved using mains water temperature control.  

The benefits
The LTC was chosen as it provided an efficient solution to cooling a large number of condensers in the teaching lab.  The solution meant that experiments could be performed around the clock, without concerns over water usage or the risk of flooding.  Teaching staff could be confident that reactions were occurring at the right temperature and due to the quiet functioning, units were unobtrusive in the busy environment. 

Product Calibration

A product calibration service is available which includes a calibration certificate, traceable to national standards.  Please enquire prior to placing order. 

Hűthető cirkulációs vízfürdők ismertető