Grant Instruments R Series User manual

Operating instructions
Low temperature
bath/circulator
R series

Page 2
Low temperature bath/circulator
Operating instructions
Version 3 - May 2005

Contents
1 Safety......................................................................................4
2 Getting Started.......................................................................6
3 Operation ...............................................................................8
2.1 Unit overview
2.2 Unpacking
2.3 Installation
3.1 Controls and features
3.2 Rear panel reference and description
3.3 Thermostat unit
3.4 Filling
3.5 Switching ON and setting up
4 Specific examples................................................................12
5 Fault diagnosis.....................................................................15
6 Technical specification........................................................17
7 Pump specifications.............................................................19
8 Maintenance..........................................................................21
9 Guarantee and service.........................................................22
7.1 Cleaning
7.2 Replacement of fuses
Page 3
Low temperature bath/circulator
Operating instructions
Version 4 - Jan 2010

1 Safety
The following symbols mean:-
Caution: Read these operating instructions fully before use and pay particular attention to
sections containing this symbol.
Caution: Surfaces can become hot during use.
Always observe the following safety precautions.
Use only as specified by the operating instructions, or the intrinsic protection may be impaired.
After transport or storage in humid conditions, dry out the unit before connecting it to the supply voltage.
During drying out the intrinsic protection may be impaired.
Connect only to a power supply with a voltage corresponding to that on the serial number label.
Ensure that the mains switch and isolating device (power supply connector) are easily accessible during use.
Connect only to a power supply which provides a safety earth (ground) terminal.
Before moving, disconnect at the power supply socket.
Do not touch surfaces which become hot during high temperature operation.
Ensure that the operating temperature is less than the maximum operating temperature of your sample
material.
Do not block or restrict ventilation slots.
If liquid is spilt inside the unit, disconnect it from the power supply and have it checked by a competent
person.
Do not check the temperature by touch, use the temperature display (where applicable) or a thermometer.
To reduce the risk of eye injury during high temperature operation, use safety goggles or spectacles.
1. Safety
Low temperature bath/circulator
Operating instructions
Page 4
Version 4 - Jan 2010

It is the user's responsibility to carry out appropriate decontamination if hazardous material is spilt on or
inside the equipment.
Do not connect to a power supply or switch on before filling the tank.
Take care when topping up or draining, as the liquid in the tank may be very hot or cold.
If the alarm lamp is illuminated do not touch the liquid or the tank base, they may be very hot. Refill
carefully, a hot heater can cause a spattering of very hot water droplets and scalding steam.
Always use a lid or polypropylene spheres when operating above 60°C. Take care when raising and
removing the lid, it may be hot. Steam and hot vapours can cause scalding.
Drain before moving the bath. Before draining allow the liquid to cool to below 50°C.
Use only liquids specified in the operating instructions, within the specified temperature range. If the alarm
lamp is illuminated the liquid temperature may be above its recommended maximum: do not inhale the
vapours given off as they may be toxic; liquids should be safely discarded and replaced.
When pumping to external apparatus, always use connecting pipe or hose suitable for the operating
temperature and liquid used, and check that the pipe connections are secure.
Do not use Silicone tubing when pumping Silicone oil.
Do not disconnect any pipes or hoses while they contain very hot or cold liquid.
Refrigerated circulators are heavy, take care when lifting or moving; empty weights vary from 24kg to 88kg.
Do not touch condenser fins, they are sharp and may cut.
Page 5
Low temperature bath/circulator
Operating instructions
Version 4 - Jan 2010

2. Getting started
2.1 Unit overview
2.2 Unpacking
Optima low temperature circulators provide a source of cooling for many sensitive
analytical procedures. Applications requiring the precision temperature control of
samples include spectrophotometry, viscometry, refractrometry and electrophoresis.
Grant’s range of more powerful chillers are ideally suited for applications requiring the
removal of the mechanical or electrical heat produced in apparatus or machinery,
combined with a higher pressure flow for faster heat removal within restricted systems.
Remove packing materials carefully, and retain for future shipment or storage of the unit.
Packs should contain:
2.3 Installation
To avoid condensation on internal components, allow the unit to reach room temperature
before switching it on.
Let the unit stand in its intended working position for 6 hours before switching on. This is
to allow the oil to drain to the bottom of the compressor.
Position the equipment so that there is free air flow through it. Allow at least 100mm
clearance from obstructions on all sides.
COOLER UNIT
Lid
Mains cable
Communications cable
Interconnecting power cable
Operating instructions
Operating voltage
R1R1 R2 R3 R4 R5 R1L R2L R3L R4L
240V 240V 240V 240V 240V 115V 115V 115V 115V
Page 6
Low temperature bath/circulator
Operating instructions
Version 4 - Jan 2010

2.3.1 Assembly - All models (see Fig 1)
Remove the thermostat mounting plate from the tank by unscrewing the four black knobs
located in the corners of the plate (1a).
Feed the Optima thermostat through the hole in the bridge plate, being careful not to
force it. The thermostat can be located either facing forward or facing to the left. In either
position three of the holes in the mounting plate will line up with holes in the thermostat
unit (1b). Screw together using M3x6 stainless steel screws supplied with the thermostat
unit.
Reattach mounting plate to unit (1c).
2.3.2 Power Supply R1, R2, R3 (see Fig 3a/3b)
Power Supply R4,R5 (see Fig 3c)
Power Supply - 115v models (see Fig 3d/3e/3f)
The Thermostat unit takes its power from the mains socket outlet ( ) on the rear of the
cooler unit, via the interconnecting power cable.
Plug one end of this interconnecting cable into the power inlet socket on the rear of the
Thermostat unit and the other end into the socket outlet ( ) mounted on the rear of the
cooler unit.
Plug the mains cable (supplied with Optima thermostat) into the fused power inlet socket
( ) on the rear of the cooler unit.
The Thermostat unit is connected from the twin fused power inlet socket directly to the
mains with the IEC cable supplied with the Optima Thermostat. The refrigeration unit is
connected from the twin fused power inlet socket ( ) directly to the mains with the IEC
cable supplied with the Refrigeration unit.
The Thermostat unit is connected via its power cord directly to the mains . The
refrigeration unit is connected via its power cord directly to the mains.
Fig 1a Fig 1b Fig 1c
screw
screw
screw
Page 7
Low temperature bath/circulator
Operating instructions
Version 4 - Jan 2010
2
2
3
3

3. Operation
3.1 Controls and features (see Fig 2)
With the switch in the position the minimum operating temperature is 5°C.
Below this, the cooling will be switched off by a low temperature protecting
thermostat. If water is used in the bath this will prevent it from freezing. In the
position the thermostat is bypassed allowing the unit to
run at its minimum temperature.
To drain the unit first connect a suitable length of hosing
with a bore of 12.7mm (½’') to the drain insert. Have the
non connected end of tubing in a receptacle, suitable for
the liquid to be drained. Push the drain insert into the
drain body and let the liquid drain. To release the drain
insert push down the grey button on the drain body. Liquid
to be drained should not be below 10°C or above 40°C.
Enables access to the condenser for easy cleaning.
Refrigeration unit power (mains) switch.
Over temperature protection re-set.
5° Switch.
Drain/ Drain insert (not fitted on R1/R1L Models).
Removable grille
The unit is protected from over heating by the over temperature cut-out. This
will be actuated between 110°C and 120°C. To re-set the unit first wait for the
liquid to cool below 100°C. Un-screw the black cap, under this is the re-set
button, push in to re-set.
A
B
C
D
E
Fig 2
Page 8
Low temperature bath/circulator
Operating instructions
Version 4 - Jan 2010
A
B
C
D
E

3.2 Rear panel reference and description (see Fig 3)
IEC outlet to accessory pump.
IEC outlet to Optima Thermostat unit.
IEC inlet to Refrigeration unit with integral twin fuse draw.
Communications link socket. The refrigeration unit may be controlled with an
Optima GR150 or GP200 thermostat unit. This is done by linking the
thermostat to the refrigerator with the communications lead supplied. (See specific
examples in section 4)
Fuse protection for the Communications Lead.
Mains input cable.
Mains input fuse holders.
FUSE
250mA(T)
5
4
3
1
FUSE
250mA(T)
54
2
3
1
1
2
3
Fig 3a
R1
Fig 3b
R2/R3
Fig 3c
R4/R5
Page 9
Low temperature bath/circulator
Operating instructions
Version 4 - Jan 2010
1
2
3
4
5
6
7

3.3 Thermostat unit
Allowable temperature range with suitable Refrigeration Units:
For information on operating the Optima Thermostat Units refer to the following operating
instructions ( as supplied with the units):
GA100, GD100, GD120...................Part No.17090
GR150, GP200................................Part No. 17091
Max. temperature ºC
Min. temperature ºC
R1
100
-20
R2
100
-20
R3
100
-30
R4
100
-30
R5
100
-47
REFRIGERATION UNIT
Max. temperature ºC
Min. temperature ºC
Pump
Use with communications cable
GA100
99
0
GD100
99
0
GD120
99
-20
ü
GR150
99
-50
ü
ü
GP200
99
-50
ü
ü
OPTIMA UNIT
Fig 3d
R1L
Fig 3e
R2L/R3L
Fig 3f
R4L
1
7 7
6
FUSE
250mA(T)
1
7 7
6
5 4
6
AA
B
B
DE
AA
FUSE
250mA(T)
77
1
4 5
.
Page 10
Low temperature bath/circulator
Operating instructions
Version 4 - Jan 2010