i CONTENTS 1 INTRODUCTION 1 Overview ............................................................................................................................ 1 Safety features .................................................................................................................... 3 Operator Safety ................................................................................................................. 3 2 UNPACKING AND ASSEMBLY 5 Assembly procedure ..........................
ii A APPENDIX A — MODEL CT-2000 PROBLEM ANALYSIS B APPENDIX B — CORRECTING SHAFT & IMPELLER MISALIGNMENT 31 29 Shaft run-out correction .................................................................................................... 31 C APPENDIX C — CHOOSING A TEMPERATURE BATH LIQUID D APPENDIX D — CT-2000 SPARE PARTS LIST E APPENDIX E — WARRANTY/RETURN INFORMATION 33 35 37 Products limited warranty..........................................................................................
1 CHAPTER 1 INTRODUCTION Overview Scope of the manual This manual is intended to provide information on the installation, characteristics and operation of the CANNON® CT-2000 Constant Temperature Bath. The CT-2000 The CANNON® CT-2000 Constant Temperature Bath is designed to maintain precise temperatures at a wide range of settings for accurate viscosity measurements.
2 Temperature selection 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. Temperature stability 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.
3 Safety features Overheat thermistor 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. RTD cutoff detection If the control RTD is disconnected, all power to the bath heaters is cut off. Liquid-level sensor Operation of the bath is not possible unless it is filled with liquid to a safe operating level.
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5 CHAPTER 2 UNPACKING AND ASSEMBLY This chapter of the manual provides assistance in unpacking and assembling the CT-2000 Constant Temperature Bath. Unpacking the CT-2000 1. Remove all components from the shipping container(s). 2. Remove any and all packing materials (Styrofoam, etc.) from the components. 3. Verify reception of shipped materials by comparing equipment items with packing/parts list(s). Report missing items to CANNON® Instrument Company immediately. 4.
6 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. Figure 2: Detaching top cover 4. Remove the front top cover and rear top cover (see Figures 3 and 4).
7 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 cabinet so it seats evenly on the rubber support ring. Figure 6: Seating the gasket 6. Unwrap the two glass panels.
8 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.
9 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.
10 Thermometer immersion Proper thermometer immersion is critical for viscosity measurements. Even a calibrated thermometer will read incorrectly if is it improperly immersed in the bath. “Total 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.
11 Draining the Bath If it becomes necessary to drain the liquid from the bath: Obtain a suitable container to hold all of the liquid drained from the bath (approximately 20-22 liters or 4.5 - 5 gallons). Make sure that the bath liquid is within 10°C of ambient temperature. Then insert a tube into the bath chamber from the top opening and siphon the liquid from the bath into a container positioned lower than the bath.
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13 CHAPTER BATH OPERATION 3 NOTE Different thermometers have different installation requirements. Refer to the information included with the thermometer in use for specific installation instructions. Applying power Caution Do not power up the CT-2000 without completing the installation requirements. Make sure that the mains voltage specified on the rear identification label matches your mains voltage.
14 TEMPERATURE Actual Target 20.003 C 100.000 C HEATING To Cold Start the CT-2000, toggle the power BATH switch up. The POWER lamp should light when bath power has been activated. The five LED’s in the lower row of keys will blink on and then off, and the instrument will emit a short “beep” tone. Bath lighting To activate Bath Unit fluorescent lights, toggle the LIGHTS switch up. The switch lamp indicator will light when power is supplied to the fluorescent lights.
15 CT-2000 Self-Test TEST: TEST PURPOSE: Display Verifies function of the liquid crystal display (LCD) screen. The user may visually check for bad segments on the display. 32K RAM Verifies normal operation of CT- 2000 system memory. Pulse Width Verifies function of the PWM. Modulator A/D Calibrates analog–digital converter and verifies function and consistency. Voltage Levels Verifies power supply voltage levels (positive and negative).
16 If the self-test sequence is accomplished successfully, the CT-2000 will commence normal operations. If any component of the self-test fails, the following message will appear on the LCD, accompanied by an audible warning tone: Diagnostics Report Some Tests FAILED See Owner's Manual Press ENTER to go on The ENTER key will flash in a repeating pattern and the heating LED will not light (see Warm Start information, page 12).
17 The front panel of the CT-2000 provides a Liquid Crystal Display (LCD) screen and a simple keypad interface (see Figure 12). .)21 Figure 12: The CT-2000 front panel Using the keypad The keypad on the front panel of the CT-2000 consists of fifteen keys: white numbers 0 through 9 a white decimal point (.
18 MENU allows user to change temperature scale (°F-°C), reset calibration offsets and change other system settings (See Menu options). Setting bath temperature SET TEMP To set the bath temperature, choose SET TEMP from the keypad after a successful Cold Start. The LCD will display a message requesting user input of the new target temperature. Use the numeral keys to input the new temperature. You may enter positive numbers from 10°C to 150°C (50°F. To 302°F.) to three decimal places.
19 Calibrating the CT-2000 The CT-2000 can be calibrated to any temperature reference standard for any desired Celsius or Fahrenheit temperature. The controls for entering the target (desired) temperature and the calibration at this temperature are convenient and largely intuitive. The instrument stores calibration corrections for every temperature integer. Procedure Use the CAL TEMP keypad option to calibrate the CT-2000 to your ASTM thermometer for a given temperature.
20 MENU options The MENU selection from the CT-2000 keypad permits the user to access three functions: Change to (C/F) Changes screen display to alternate temp. scale Bath Temp Offsets Globally adjusts calibration data COM Setup Sets computer communication options Change to (C/F) The Change to (Celsius or Fahrenheit) option is essentially a toggle between two temperature scales.
21 General Bath Offset The General Bath Offset is a protected function of the CT-2000. This option is a global adjustment which is made at the factory by CANNON®. In rare instances when this setting may need to be altered, the adjustment should be made in consultation with an authorized CANNON® representative. Communication options Several communication options between the CT-2000 and your computer may be configured from the MENU keypad option.
22 If the CT-2000 was previously configured to operate in a polled (RS-485) environment, the following will appear on the LCD: COMMUNICATION MODE 1. Polled 2. Point to Point (Reports Disabled):1 The last line on the LCD indicates that timed reports are disabled and the present mode is polled. In this example, to operate in a point-to-point (RS-232) environment with or without timed interval reports, you would then press: [2] [ENTER] NOTE To configure reports, see page 20.
23 The frequency of temperature sampling for the report (in seconds) can then be selected from the options on the LCD screen. The report parameters range from a report each second (keypad selection [2] [ENTER] ) to a report every two minutes (keypad selection [8] [ENTER] ). NOTE This option may be turned off (selection 1) if there is no computer connected via the serial line.
24 All Commands or Queries must be preceded by the forward slash (/) and the selected address (0-9 or A-F). Commands are identified with the letter C and Queries are identified with the letter Q; these identifiers follow the address and precede the command or query information. All Commands or Queries must end with a carriage return (R). For examples of CT-2000 command and query language, consult the tables on the following pages.
25 Command Type " $$" Possible Argument “&..&” Description of Action Taken by CT-2000 AD none Calibrates the 16 bit A to D converter. When done the response is AD_NO if the calibration failed, or ADYES if the calibration was successful. If the command is not recognizable, an ERR is returned. As an example, if this command was sent to a CT- 2000 with an address of 5: /5CAD The response might look like this -5CADYES RT none Runs a complete self- Test like the one that is run on power up.
26 Command Type " $$" Possible Argument “&..&” Description of Action Taken by CT-2000 ST +&&&.&&& Sets the target (desired) Temperature of the bath as defined by the argument +&&&.&&& which is in degrees Celsius or Fahrenheit as previously set. Only fixed point numbers will be accepted and they must be within the operating range of the bath. If the command is accepted, a STYES will be the response, otherwise a ERR will be returned.
27 Query Possible Type Argument " $$" "&..& Description of Response given by CT-2000 TB CF Transmits all of the whole degree temperature Bins for either Celsius or Fahrenheit or else ERR is transmitted. This response has the bin number in the first five columns followed by two spaces, and then the sign (if any or space if none) and the offset. As an example, if the following query is sent to a CT- 2000 at address 9: /9QTBC This queries the Celsius bins. The following report will be received: 10C 0.
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29 CHAPTER APPENDIX A — MODEL CT2000 PROBLEM ANALYSIS A A successful CT-2000 self-test is an indicator that there are no detectable errors and checked components are functional . There are certain conditions, however, that cannot be verified by these automatic tests. These include: 1. 2. 3. 4. 5. Viscosity of the bath liquid.
30 Problem Possible cause/solution Bath does not heat. • Sensors not operational. Check connections for sensors on rear panel. • Temperature set lower than current bath temperature. Check temperature setting — it must be above existing bath temperature for heat to go on. • Bath fluid level may be too low. Add fluid per manual instructions. Bath control outside of specific limits.
31 CHAPTER B APPENDIX B — CORRECTING SHAFT & IMPELLER MISALIGNMENT Motor-stirrer units supplied by CANNON® Instrument Company are checked after assembly to ensure minimum run-out (deviation from concentric rotation) at the impeller end of the shaft. The following instructions are intended to assist those who may be experiencing excessive vibration in the motor-stirrer because of shaft run-out or misalignment of the impeller blades. Set Screw Alignment The motor shaft contains a flat area.
32 3. Touch the tip of a soft crayon (such as a glass marking pencil) momentarily to the side of the shaft near the impeller end while the motor is running. The mark produced by the crayon will be evident as a line part way around the shaft. 4. Unplug the motor, hold the motor tightly against the body, and grasp the shaft in the right hand. 5. Bend the shaft away from the line segment on the shaft. 6. Repeat the test procedure, marking the shaft at a location slightly removed from the first crayon mark.
33 CHAPTER C APPENDIX C — CHOOSING A TEMPERATURE BATH LIQUID The ideal bath liquid would possess low viscosity, high heat capacity, and low vapor pressure over a wide range of temperatures. In addition, the liquid should have a very high flash point and be relatively low in cost. If the fluid is to be used in a kinematic viscosity bath where it is necessary to view the instruments through the bath liquid, then it is important for the liquid to be clear and without color.
34 IBF Bath Oil IBF Bath Oil contains an oxidation inhibitor which reduces tendency to darken at higher temperatures. Viscosity is 36 cSt at 40°C, 5.6 cSt at 100°C. This oil is available from CANNON® (catalogue # 9726-L20). Silicone fluids Silicone fluids are available in a wide range of viscosities and can be used over a wide range of temperatures. However, silicones are also relatively expensive liquids. Also, a bath containing silicones requires extra care when used for capillary viscometry.
35 CHAPTER D APPENDIX D — CT-2000 SPARE PARTS LIST Following is a list of parts for the CT-2000 which may be ordered from CANNON® Instrument Company. Part Number P20.1 P20.22 P22.26 P22.39 P22.40 P25.3190 P27.1260 P27.1300 P27.1310 P27.1320 P27.2280 P27.2330 P27.2331 P27.5110 P27.5250 P27.5260 P27.5270 P27.5271 P27.5290 P27.5291 P27.8037 P27.5410.1 P27.6100 P27.6101 P27.6121 P27.4120 P51.1432 P51.1433 P62.
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37 CHAPTER E APPENDIX E — WARRANTY/ RETURN INFORMATION Products limited warranty In addition to other manufacturers’ warrantees, CANNON® Instrument Company (“the Company”) warrants all products (other than reagents and chemicals) delivered to and retained by their original purchasers to be free from defect in material and workmanship for one year from the date of the Company’s invoice to the purchaser.
38 Returning a product to CANNON® Procedure Before returning a CANNON® product for repair or service, make every attempt to identify the problem. If, after careful checking, the problem remains unidentified or unsolved, telephone CANNON® Instrument Company (or the local service agent) to consult with a product specialist. If the specialist cannot recommend a simple solution or repair, CANNON® will authorize the return of the product through the issuance of a Return Authorization number (RA).
