Cannon CT-2000 User Manual

CONTENTS

INTRODUCTION 1

Overview ............................................................................................................................ 1

Safety features .................................................................................................................... 3

Operator Safety ................................................................................................................. 3

UNPACKING AND ASSEMBLY 5

Assembly procedure ........................................................................................................... 6

Glass jar installation ........................................................................................................... 6

Inserting viscometer tubes/thermometers........................................................................... 9

Filling the bath.................................................................................................................. 10

Draining the Bath ............................................................................................................. 11

BATH OPERATION 13

Applying power ................................................................................................................ 13

Cold Start.............................................................................................................. 13

Warm Start ............................................................................................................ 14

Self-test sequence ............................................................................................................. 14

Front panel operations ...................................................................................................... 16

Using the keypad .................................................................................................. 17

Setting bath temperature................................................................................................... 18

Calibrating the CT-2000 ................................................................................................... 18

MENU options.................................................................................................................. 20

Change to (C/F) .................................................................................................... 20

Bath temperature offsets....................................................................................... 20

Communication options.................................................................................................... 21

Full duplex (point-to-point) connections.............................................................. 23

Half duplex and polled (multi-drop) operations................................................... 23

Commands, queries & responses.......................................................................... 23

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CT-2000 Constant Temperature Bath

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APPENDIX A — MODEL CT-2000 PROBLEM ANALYSIS 29

APPENDIX B — CORRECTING SHAFT & IMPELLER

MISALIGNMENT 31

Shaft run-out correction.................................................................................................... 31

APPENDIX C — CHOOSING A TEMPERATURE BATH LIQUID 33

APPENDIX D — CT-2000 SPARE PARTS LIST 35

APPENDIX E — WARRANTY/RETURN INFORMATION 37

Products limited warranty................................................................................................. 37

Reagent and chemical warranty........................................................................................ 37

Returning a product to CANNON®.................................................................................. 38

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CT-2000 Constant Temperature Bath

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CHAPTER

Overview

INTRODUCTION

Scope of the manual

The CT-2000

Temperature range

This manual is intended to provide information on the installation, characteristics and operation of the CANNON T emperature Bath.

The CANNON® CT-2000 Constant Temperature Bath is designed to maintain precise temperatures at a wide range of settings for accurate viscosity measurements. Because of its temperature stability and ease of use, it is also suitable for any other application where temperatures must be maintained within hundredths of one degree Celsius.

The CANNON® CT-2000 is designed to maintain temperatures from 10°C to 150°C.

CT-2000 Constant

Figure 1: The CT-2000 Constant Temperature Bath

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CT-2000 Constant Temperature Bath

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Temperature selection

Temperature stability

Bath description

The CT-2000 offers convenient keypad entry of temperature settings up to three decimal places over the entire temperature range of the instrument. The bath temperature will remain stable within hundredths of one degree of the temperature setting.

The CANNON® CT-2000 is capable of maintaining temperatures of 10°C to 100°C within 0.01°C and temperatures of 101°C to 150°C within

0.03°C or closer. (Temperature stability at or below ambient may vary depending on the quality of the external cooling unit.)

The bath chamber is a cylindrical clear vessel 300 mm (12 inches) in diameter and 300 mm (12 inches) high. A stainless steel baffle coated with white PTFE is located in the center of the bath and provides a convenient backdrop for viewing viscometers placed in the bath. The top cover contains seven round holes 51 mm (two inches) in diameter for insertion of viscometer holders. T wo smaller holes are provided for thermometers. T win fluorescent lamps provide glare-free illumination of the bath.

Microprocessor circuitry, functioning in tandem with a pair of heaters and a stainless steel-encased R TD provides stable and accurate temperature control. A motor -driven stirrer ensures that a uniform temperature is maintained throughout the bath.

ASTM D 445 specifications

Cooling coil

The bath housing is fabricated from heavy aluminum and coated with a corrosion-resistant epoxy . The top cover consists of three layers; a stainless steel top surface, an insulating layer, and a bottom stainless steel heat reflector.

The CT-2000 temperature control provides the accuracy required by ASTM D 445 for kinematic viscosity measurements.

A built-in cooling coil, when connected to tap water or a cooling system, permits operation to 10° Celsius.

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CT-2000 Constant Temperature Bath

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Safety features

Overheat thermistor

RTD cutoff detection

Liquid-level sensor

Operator Safety

A thermistor in the bath senses any over-temperature fault condition. If such a condition occurs, all power is removed from the bath heaters until an operator resets the over-temperature limit circuit.

If the control RTD is disconnected, all power to the bath heaters is cut off.

Operation of the bath is not possible unless it is filled with liquid to a safe operating level. A liquid-level sensor prevents the control circuit from heating the bath until the safe operating level is attained. The bath heaters are automatically turned off if the bath liquid drops below the minimum safe level.

All technicians who use the CT-2000 should follow these basic safety procedures:

 Use appropriate safety precautions for working with high-tempera-

ture liquids/equipment.

 Follow instructions in this manual regarding use and maintenance of

the CT-2000.

 Do not place the CT-2000 system on an unstable cart or stand. The

CT-2000 should be placed on a stable laboratory table or bench.

 If any liquids are spilled into the electronic components of the CT-

2000, remove power from the unit and contact CANNON ment Company immediately .

Instru-

 Do not position power cords so that they are likely to be walked on

or pinched by items placed on or against them. Keep all connections as neat as possible.

 If the CT-2000 will not be used for an extended period of time,

unplug the power cord from the wall outlet. To disconnect the power cord, pull it out by the plug. Never pull the cord itself.

CAUTION

CAUTION The bath fluid used with the CT-2000 may be dangerous. Use the proper

Do not attempt to service the CT-2000 system beyond the basic installation and troubleshooting guides provided with this manual. Contact

CANNON® Instrument Company regarding service and repair needs.

safety precautions when handling the bath fluid in use (refer to the Material Safety Data Sheet included with the bath fluid for more detail.)

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CT-2000 Constant Temperature Bath

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CHAPTER

Unpacking the CT-2000

UNPACKING AND ASSEMBLY

This chapter of the manual provides assistance in unpacking and assembling the CT-2000 Constant Temperature Bath.

1. Remove all components from the shipping container(s).

2. Remove any and all packing materials (Styrofoam, etc.) from the components.

Damaged items

3. Verify reception of shipped materials by comparing equipment items with packing/parts list(s). Report missing items to CANNON Instrument Company immediately .

4. Inspect each component for signs of damage. Report damages to the shipper and to the CANNON

Retain all packing materials until the instrument is connected and functioning properly . If any component(s) must be returned to CANNON Instrument Company, the damaged item(s) should be packaged in the original shipping container. Refer to APPENDIX E of this manual for instructions on returning defective equipment. Customers outside the United States should contact the local CANNON® agent for procedures on returning products to CANNON® .

The CANNON® CT-2000 Constant Temperature Bath is shipped in several boxes containing the following:

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 bath housing, including the electronics drawer  motor and stirrer, including the impeller and mounting plate  glass bath jar  Allen wrench  front glass panel pieces (2)  seven hole covers  jar gasket top and bottom  rubber thermometer holder  instruction manual

The bath unit housing is shipped completely assembled. However, the glass jar, the glass panels, and the motor and stirrer must be installed. To allow this, some disassembly of the bath unit housing is required. The tools required are a utility knife, Phillips screwdriver, and a 1/8" Allen wrench. The Allen wrench is included with the bath.

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Assembly procedure

1. Unpack the bath unit housing and move it to its permanent location on a stable laboratory bench or table.

2. Remove all eight screws from the stainless steel top covers (see Figure 2).

3. Disconnect all external cabling (probes, heaters, and float switch) from the upper rear panel of the CT-2000.

4. Remove the front top cover and rear top cover (see Figures 3 and 4). Use caution when removing the rear top cover because the temperature control probes and heating elements are attached to it.

Figure 2: Detaching top cover

Glass jar installation

1. Remove the glass jar from its box.

WARNING

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The glass jar is heavy. Use caution when lifting it.

2. Make sure the rubber

3. Place the rubber gasket

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Figure 3: Removing front top cover

support ring is seated properly around the bottom jar opening in the bath unit (see Figure 5).

around the top rim of the jar (see Figure 6). The

CT-2000 Constant Temperature Bath

Figure 4: Removing back top cover

Figure 5: Seating the support ring

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rubber may have to be trimmed slightly to allow the ends of the rubber gasket to meet with no gap when placed around the rim.

4. Remove the large piece of foam packing from the inside of the cabinet. Also remove the small piece of foam from the float level, located on the upper left-hand corner of the inside of the cabinet.

5. Lower the glass jar into the

Figure 6: Seating the gasket

cabinet so it seats evenly on the rubber support ring.

6. Unwrap the two glass panels. Place the thinner of the two pieces of glass in the slot closest to the jar (see Figure 7).

7. Place the wider (tempered) piece of glass in the front slot furthest away from the jar. The middle slot is left empty as a vapor barrier.

8. Replace the rear top cover.

Figure 7: Placing inner glass panel

Align the four holes, then insert and tighten the screws.

9. Replace the front top cover . Line up the four holes, then insert and tighten the screws.

10. To ensure that the gasket forms a tight seal with the top covers of the bath, proceed as follows:

11. Loosen the IEC lock screw securing the AC power cord to the rear panel of the electronics drawer. Then unplug all three cables (AC power, rectangular Cinch connector and round Amp connector) from the rear of the electronics drawer.

12. Pull out the electronics drawer using the handles provided on the front of the unit. Press down or pull up on the plastic release bars on either side of the drawer track to release the drawer, then pull the drawer completely free of the unit and set it aside.

13. When the drawer is removed, locate the four ¼-20 set screws visible at the top of the drawer opening underneath the bath.

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14. Turn the set screws clockwise with the Allen wrench (included with the bath) until the top of the jar forms a tight seal with the covers. Make sure you tighten the set screws uniformly so the jar remains level.

15. Run the AC cord through the rear panel opening.

16. Replace the drawer in the slide tracks and push the drawer back into its opening. Insert the two power plugs into the rear of the drawer assembly.

Motor-stirrer

NOTE

Complete the assembly of the bath by inserting the motor-stirrer per the instructions below:

1. T ake the motor/stirrer from its box. Remove the two screws on the top heater housing and lift off the housing (see Figure 8).

2. Check the motor-stirrer impeller blades to make sure that the flat sections all lie in the same plane (see APPENDIX B), then insert the motor stirrer into the opening provided (see Figure 9).

Figure 8: Removing heater housing

To avoid accidental bending of the motor shaft, do not hold the motor assembly by the shaft. Use care when inserting the motor shaft and impeller to prevent damage to delicate components. Two screws located on either side of the opening for the motor stirrer serve as locating pins for the motor support pad. Do not remove these screws; the holes in the pad fit loosely over their heads. The motor line cord should point toward the rear of the bath (offset slightly to the right or left). The motor stirrer should now lie flat on the top of the bath.

Figure 9: Installing motor-stirrer

3. Connect all plugs and probes to the correspondingly labeled sockets at the rear of the CT-2000 bath unit as follows (see Figure 10):

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CT-2000 Constant Temperature Bath

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Figure 10: CT-2000 electrical connections

 PREHEAT cable to PREHEAT socket  CONTROL HEATER cable to CONTROL HEATER socket  FAN cable to FAN socket

 MOTOR STIRRER cable to MOTOR socket  CONTROL PROBE cable to CONTROL PROBE socket  OVER TEMP cable to OVER TEMP socket  LEVEL FLOAT CABLE to LEVEL FLOAT socket

4. Reattach the top heater housing, making sure that the heater, motor, and fan cords pass through the left-hand opening (as viewed from the rear) and that the control probe, over-temperature probe, and level switch cords exit from the right opening (as viewed from the rear). The back lip on the rear top cover fits into the slot on the top heater housing. Line up the holes, insert screws, and tighten.

5. Adjust the four feet on the bottom of the bath housing to level the bath jar. This should be done prior to filling the bath with fluid.

6. Plug the CT-2000 main power cord at the back of the electronics drawer into an outlet with electrical specifications matching the label on the rear of the instrument.

Inserting viscometer tubes/thermometers

The top cover of the CT-2000 contains seven apertures, 51 mm (2") in diameter, for the insertion of viscometer tube holders. Two additional holes are provided for insertion of thermometers.

Inserting viscometer tubes

Remove the viscometer tube cover(s) from the top of the bath and carefully place the viscometer tube(s), with the proper holder attached, into the bath through the aperture(s) in the top cover. The viscometer tube should be inserted to a depth which ensures that the liquid under test and/ or any timing marks are a minimum of 6 mm (¼") below the top level of the liquid.

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Thermometer immersion

Filling the bath

CAUTION

Proper thermometer immersion is critical for viscosity measurements. Even a calibrated thermometer will read incorrectly if is it improperly immersed in the bath. “T otal immersion” kinematic viscosity thermometers should be used with the bulb and only the mercury column beneath the surface of the liquid, but with the emergent stem above the surface at ambient temperatures.

Make sure that the bath is placed in its intended final position before adding bath fluid. The CT-2000 should not be moved with bath fluid in the bath jar. NEVER USE FLAMMABLE BATH LIQUIDS.

1. Make sure that the instrument power is OFF and select a bath liquid appropriate to your operating temperature range (see APPENDIX C).

Figure 11: Filling the bath

CAUTION

2. Fill the jar with bath liquid at ambient temperature to a level sufficient to engage the float switch. This float permits bath operation when the minimum amount of fluid has been added to the bath jar.

3. Continue to add fluid until the bath liquid level has risen to approximately 40 mm (1.5") of the top of the jar.

4. Turn the instrument power ON and incrementally heat the bath to desired control temperature while monitoring the bath liquid level carefully . The bath level must be 15-20 mm (approximately ½" to ¾") from the top of the jar at the control temperature. If it becomes apparent that this liquid level will not be achieved, return the bath to within 10°C of ambient, turn the instrument power OFF and add or remove liquid as necessary .

5. Repeat step four until you have attained the proper bath liquid level at the desired control temperature.

Different bath fluids expand at different rates. Do not overfill the bath!

WARNING Monitor the level of bath liquid closely when operating the CT-2000 at

higher temperatures (100-150°C). The bath liquid will expand as the temperature increases. The CT-2000 bath jar is not designed to contain liquid under pressure. If the bath is overfilled, liquid may overflow.

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