ThermoFisher Scientific 2325 User manual

Model 2325
Temperature Controlled
Floor Model Fluid Bath
Instruction Manual #7022325
Caution: Fill tank with liquid to the proper level before putting the bath into operation. Failure to
do so will result in severe damage to the heating element.
NOTE: Do not overfill bath! Please allow for the addition of product.
IMPORTANT! READ THIS INSTRUCTION MANUAL. FAILURE TO READ,
UNDERSTAND, AND FOLLOW MANUAL INSTRUCTIONS MAY RESULT IN DAMAGE
TO THE BATH, INJURY TO OPERATING PERSONNEL, AND POOR EQUIPMENT
PERFORMANCE.
CAUTION: ALL INTERNAL ADJUSTMENTS AND MAINTENANCE MUST BE
PERFORMED BY QUALIFIED SERVICE PERSONNEL.
Revised October 1992

TABLE OF CONTENTS
SECTION 1 - INTRODUCTION
1.1 Standard Features
1.23 Auxiliary Equipment
SECTION 2 - SPECIFICATIONS
2.1 Construction
2.2 Dimensions
2.3 Capacity
2.4 Heating and Refrigeration
2.5 Temperature
2.6 Pump
2.7 Electrical Requirements
SECTION 3 - INSTALLATION
3.1 Location
3.2 Power
SECTION 4 - CONTROL AND INDICATING DEVICES
4.1 Main Power Switch and Indicator Light
4.2 Refrigeration Switch and Indicator Light
4.3 External Circulation Pump Switch and Indicator Light
4.4 Dual Temperature Range Select Switch
4.5 CH/P Temperature Controller and LCD Display
4.6 Heat Indicator Light
4.7 Cool Indicator Light
SECTION 5 - OPERATION
5.1 Filling and Emptying the Bath
5.2 Initial Settings
5.3 Setting the Temperature Setpoint
5.4 External Circulation (With Standard Pump)
5.5 External Circulation (With Optional 1/3 HP Pump)
SECTION 6 - PREVENTATIVE MAINTENANCE
6.1 Temperature Calibration Check
6.2 Cleaning the Bath
6.3 Refrigeration System Maintenance
6.4 Pump

SECTION 7 - SERVICE
7.1 Access to the Control Panel
7.2 Temperature Controller Recalibration
7.3 Replacing the Heaters
7.4 Replacing the Pump
7.5 Replacing the Temperature Control Circuit Board
7.6 Troubleshooting Guide
SUPPLEMENTS, PARTS LIST, SCHEMATICS, WARRANTY INFORMATION

SECTION 1 - Introduction
Table of Contents
1.1 Standard Features
1.2 Auxiliary Equipment

1.1 Standard Features
CH/P TEMPERATURE CONTROL SYSTEM
~ The CH/P temperature control system features temperature selectivity in 0.1 degree C
increments.
~ Proportional control output minimizes temperature over shoot and provides long-term
temperature stability.
~ LCD. display continuously provides direct digital readout of actual bath temperature.
CONSTRUCTION
~ All wetted parts in the bath are constructed of stainless steel.
~ A 3/4" Colorlith (TM) top provides for strength and increased resistance to physical abuse from
acids, alkalis, and solvents.
DUAL STAGE PUMP
~ The dual stage pump adds to the versatility of the bath by utilizing separate pressure and suction
stages of the pump so that both the liquid level and temperature of external open vessels can be
closely controlled.
DUAL TEMPERATURE RANGE
~ The bath is capable of dual temperature range, allowing for a choice between (-29 Degrees C to
+70 Degrees C) or (+20 Degrees C to +100 Degrees C). Temperature range selection is controlled
by a switch on the back of the control panel.
1.2 AUXILIARY EQUIPMENT
ADJUSTABLE PLATFORM: Stainless steel; supports working apparatus at various levels within
the bath tank.
Catalog #931025
TEST TUBE RACK: Polypropylene rack fits into the bath opening. Should be purchased with the
adjustable platform. Two sizes are available:
~ 40 Tube Capacity - Catalog #950060
(Holds up to forty 20mm test tubes)
~ 72 Tube Capacity - Catalog #950040
(Holds up to seventy two 13mm test tubes)

SECTION 2 - SPECIFICATIONS
Table of Contents
2.1 Construction
2.2 Dimensions
2.3 Capacity
2.4 Heating and Refrigeration
2.5 Temperature
2.6 Pump
2.7 Electrical Requirements

SECTION 2 - SPECIFICATIONS
2.1 CONSTRUCTION
Exterior: 18 Gauge Cold Rolled Steel
Interior: 20 Gauge Stainless Steel, 2-B Finish
Insulation: 2" Thick Urethane Foam
2.2 DIMENSIONS
Exterior: 34.25" W x 34.25" H x 22.5" F-B
Interior: 20.625" W x 12" H x 13.0" F-B
2.3 CAPACITY
Tank Capacity: 17 Gallons (64.4 liters)
Shipping Weight: 250 lbs. (113 kg.)
2.4 HEATING AND REFRIGERATION
Heaters: (2) 650W Flanged Cartridge Immersion Heaters
Refrigeration: (1) 1/2 HP Compressor
2.5 TEMPERATURE
Controller: Chip Proportional
Dual Range: -29 to +70 Degrees C
+20 to +100 Degrees C
Control Sensitivity: +/- .02 Degree C
2.6 PUMP
Dual Stage
(Optional) 1/3 HP Bronze Centrifugal
2.7 ELECTRICAL REQUIREMENTS
230V, 1 Phase, 3 Wire, 60 Hz, 19 FLA

SECTION 3 - INSTALLATION
Table of Contents
3.1 Location
3.2 Power

SECTION 3 - INSTALLATION
3.1 LOCATION
Locate the bath on a firm, level surface in an area of minimum ambient temperature fluctuation. Be
sure the rear of the cabinet is at least three inches from any walls or obstructions.
3.2 POWER
Connect the bath to a suitable grounded power source. Refer to serial tag on the back of the unit for
specific electrical specifications.
WARNING: THE POWER OUTLET MUST BE GROUNDED.
WARNING: DO NOT OPERATE THE BATH AT TEMPERATURES ABOVE 70C. TO DO SO
MAY DAMAGE THE INSULATION AND RENDER THE BATH INOPERABLE.

SECTION 4 - CONTROL AND INDICATING DEVICES
Table of Contents
4.1 Main Power Switch and Indicator Light
4.2 Refrigeration Switch and Indicator Light
4.3 External Circulation Pump Switch and Indicator Light
4.4 Dual Temperature Range Select Switch
4.5 CH/P Temperature Controller and LCD Display
4.6 Heat Indicator Light
4.7 Cool Indicator Light
WARNING: DO NOT ATTEMPT TO OPERATE THE BATH WITHOUT LIQUID IN IT OR
SEVERE DAMAGE TO THE UNIT WILL OCCUR.

SECTION 4 - CONTROL AND INDICATING DEVICES
4.1 MAIN POWER SWITCH and indicator light
The main power switch controls the ON/OFF electrical power to the bath. When the switch is
turned ON, the control systems, the pump and bath heater are activated.
The power indicator, located above the main power switch, is activated when the main power
switch is in the ON position and the bath is receiving power.
4.2 REFRIGERATION SWITCH and indicator light
The refrigeration switch controls the ON/OFF power to the compressor. The switch should be
turned ON when operating temperature of the bath is below 40 degrees C.
The indicator light, located above the refrigeration switch, is activated when the compressors are
receiving power.
4.3 EXTERNAL CIRCULATION PUMP SWITCH
AND INDICATOR LIGHT
The "EXTERNAL CIRCULATION PUMP" switch, located on the back of the control panel,
controls "ON/OFF" power to the 1/3 HP centrifugal bronze external pump.
The indicating light is activated when the external circulation pump switch is in the "ON" position
and power is being supplied to the external circulation pump.
NOTE: An appropriate drain line should be attached to the 1/4" x 1/8" reducer nipple at the bottom
of the external circulation pump, stock number 184027.
4.4 DUAL TEMPERATURE RANGE SELECT SWITCH
The dual temperature range select switch, located on the back of the control panel housing, permits
the selection between -29C to +70C and +20C to +100C temperature ranges. .
To set the temperature range for -29C to +70C, place the switch in the "UP" position. To set the
temperature range for +20C to +100C, place the switch in the "DOWN" position.
NOTE: Set the range select switch to the desired range before proceeding to establish the operating
setpoint.
4.5 CH/P TEMPERATURE CONTROLLER AND LCD DISPLAY
The CH/P temperature controller allows for setpoint adjustment of the bath temperature.
1) Bath temperature is indicated on the digital display when the bath is in regular operation.
2) Temperature setpoint is indicated on the digital display when the "Hold for Setpoint" switch is
in the down position.

3) Temperature setpoint is set by pressing the "Hold for Setpoint" switch and manipulating first the
coarse then the fine adjustments until the desired operating temperature is indicated on the digital
display.
NOTE: If the last digit of the display flickers after the bath temperature has stabilized, use the fine
adjustment to correct the problem.
If following stabilization of the bath, the actual temperature consistently reads .1 degree C above
setpoint, adjust the fine control to a slightly lower level in the same setpoint to correct the problem.
4.6 Heat INDICATOR LIGHT
The HEAT indicator light is activated whenever there is a demand for an increase in bath
temperature. The heat light cycles with the bath heaters.
4.7 COOL INDICATOR LIGHT
The amber "COOL" indicator light cycles with the refrigeration capacity modulator and is activated
whenever the compressor is operating to meet setpoint requirements.

SECTION 5 - OPERATION
Table of Contents
5.1 Filling and Emptying the Bath
5.2 Initial Settings
5.3 Setting the Temperature Setpoint
5.4 External Circulation Pump (With Standard Pump)
5.5 External Circulation Pump (With Optional 1/3 HP Pump)

5.1 FILLING AND EMPTYING THE BATH
Fill the bath to a level approximately 2 inches below the top of the stainless steel tank with distilled
water (50K Ohm to 1 Meg Ohm). NOTE: THE WATER LEVEL SHOULD NOT BE LESS
THAN TWO INCHES FROM THE TOP OF THE TANK WHEN FULL WITH PRODUCT.
This water type is recommended for applications above 10C. For applications below 10C,
Methanol or a solution of antifreeze and distilled water (50K Ohm to 1 Meg Ohm) water is
recommended. Follow the directions on the antifreeze container to obtain the proper mix.
CAUTION: THE BATH TANK MUST BE FILLED WITH DISTILLED (50K TO 1 MEG OHM)
WATER.
CAUTION: PURITY OF THE DISTILLED WATER USED IN THE BATH TANK MUST BE
WITHIN THE 50K OHM TO 1 MEG OHM RANGE TO PROTECT, AND PROLONG THE LIFE
OF THE STAINLESS STEEL TANK. USE OF TAP WATER, OR DISTILLED WATER
OUTSIDE THE SPECIFIED RANGE, WILL DECREASE THE OPERATING LIFE OF THE
UNIT AND WILL VOID THE WARRANTY.
CAUTION: IF THE LIQUID LEVEL IN THE TANK IS TOO HIGH, THE LIQUID MAY
SPLASH OUT OF THE BATH.
CAUTION: REGULARLY CHECK SOLUTION LEVEL IN THE BATH TO ENSURE THAT
PROPER OPERATING LEVEL IS MAINTAINED.
To empty the bath:
1. Turn off the power.
2. Remove the front panel from the bath cabinet.
3. Extend the drain hose to a floor drain or container.
4. Open the ball valve to permit a flow of liquid.
5. Close valve, replace the hose and front panel after emptying.
CAUTION: DO NOT ATTEMPT TO TILT THE BATH TO EMPTY IT. TIPPING THE BATH
MAY RESULT IN SEVERE DAMAGE TO THE UNIT.

5.2 INITIAL SETTINGS
1. Set the main power switch to the ON position. This procedure should activate the power
indicator light above the switch.
2. Set the refrigeration switch to the ON position if the setpoint temperature is below 40C. The
refrigeration light should be activated by this procedure.
5.3 SETTING the TEMPERATURE SETPOINT
1) Turn the main power switch ON.
2) Set the "RANGE SELECT" switch to the desired position.
NOTE: To set the temperature range for -29C to +70C, place the switch in the "UP" position. To
set the temperature range for +20C to +100C, place the switch in the "DOWN" position.
3) If the temperature control setpoint is to be below 40 degrees C, turn the refrigeration switch
"ON".
NOTE: The refrigeration indicator light will be activated, and the cool indicator will cycle with the
refrigeration capacity modulator.
4) Depress the "HOLD FOR SETPOINT" switch, and manipulate the coarse and then the fine
adjustment knobs until the desired operating temperature is indicated on the digital display.
5) Allow the bath temperature to stabilize. If the last digit flickers after the bath temperature has
stabilized, a slight readjustment of the setpoint, using the fine adjustment, will correct the problem.
If following stabilization of the bath temperature, the actual temperature consistently reads .1
degree C above the setpoint, adjust the fine control to a slightly lower level in the same setpoint to
correct the problem.

5.4 EXTERNAL CIRCULATION (WITH STANDARD PUMP)
The 2325 Bath may be used for external circulation to open vessels. The dual stage pump can
circulate in both an open and a closed system.
1. Turn off the main power switch.
2. Disconnect the short tubing from the two connections that are located between the control panel
and the pump.
3. For a closed system, attach either end of an appropriate length of tubing to the suction (left) and
the other end to pressure (right) outlet.
4. For an open system, attach a suitable piece of tubing to each connection. Place the end of the
suction line at the maximum desired level for the external solution. Place the pressure line in the
external liquid.
5. Turn on the power.
6. Check all connections for leaks and tighten, if necessary.
NOTE: INSULATED TUBING SHOULD BE USED TO PREVENT ICING OF THE LINES.
INSULATION WILL ALSO PREVENT HEAT LOSS TO THE ATMOSPHERE.
CAUTION: CHECK THE LEVEL OF THE SOLUTION IN THE TANK TO INSURE IT
MAINTAINS THE PROPER OPERATING LEVEL.
IF THE OPERATING LIQUID LEVEL IS TOO LOW, DAMAGE TO THE HEATERS MAY
OCCUR.
5.5 EXTERNAL CIRCULATION (WITH Optional 1/3 HP PUMP)
To hook up the bath for external circulation:
1) Attach a suitable piece of tubing to the 1/2" FPT located on the S.S. Ball Valve.
2) Connect the other end of the tubing to the external source.
3) Turn ball valve to open position.
4) Turn on the power.
5) Check all connections for leaks and tighten, if necessary.
NOTE: INSULATED TUBING SHOULD BE USED TO PREVENT ICING OF THE LINES.
INSULATION WILL ALSO PREVENT HEAT LOSS TO THE ATMOSPHERE.

SECTION 6 - PREVENTIVE MAINTENANCE
Table of Contents
6.1 Temperature Calibration Check
6.2 Cleaning the Bath
6.3 Refrigerator System Maintenance
6.4 Pump

6.1 TEMPERATURE CALIBRATION CHECK
The CH/P temperature controller has been calibrated prior to shipment of the unit and should not
require recalibration for most laboratory applications. However, a periodic check of the temperature
control calibration is recommended as a matter of routine maintenance.
A check of temperature calibration is especially advisable when the ambient temperature is less
than 19 degrees C (66 degrees F) or more than 29 degrees C (84 degrees F).
The calibration check should be performed with a calibrating thermometer of known quality and
accuracy, using the following method:
1) Place the calibrating thermometer inside the bath, as near the center of the fluid as possible.
2) Allow adequate time for the bath temperature and thermometer reading to stabilize.
3) Check to see if the temperature indicated on the calibrating thermometer corresponds with the
temperature indicated on the digital display.
4) If the two temperature readings differ, follow the instructions in Section 6.1 to recalibrate the
temperature controller.
6.2 CLEANING the Bath
The continued cleanliness of the stainless steel utilized in Forma products has a direct effect on the
appearance and operation of the unit.
Use the mildest cleaning procedure that will do the job effectively. To insure maximum
effectiveness and to avoid marring the surface, always rub in the direction of the finish polish lines.
Be sure to rinse the surface thoroughly, at least twice, ( with 50K Ohm to 1 Meg Ohm distilled
water) after every cleaning operation. To avoid water marks, wipe the surface dry.
CAUTION: DO NOT USE CHLORINATED SOLVENTS OR OTHER HALOGENS ON
STAINLESS STEEL, AS THEY CAN CAUSE RUSTing and pitting.
The bath interior should be cleaned with a general purpose laboratory disinfectant and then rinsed,
at least twice, with sterile distilled water (50K to 1 Meg Ohm). Literature concerning recommended
disinfectants by Forma Scientific, Inc. is included as a supplement at the rear of this manual.
The cabinet exterior may be cleaned with soap and water or with any non-abrasive commercial
spray cleaner.
The following pages are a guide to be used for specific cleaning problems.