Hart Scientific 9141 Dry-Well Calibrator User’s Guide Rev.
Fluke Corporation, Hart Scientific Division 799 E. Utah Valley Drive • American Fork, UT 84003-9775 • USA Phone: +1.801.763.1600 • Telefax: +1.801.763.1010 E-mail: support@hartscientific.com www.hartscientific.com Subject to change without notice. • Copyright © 2005 • Printed in USA Rev.
Table of Contents 1 Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 1.2 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.1 1.2.2 1.3 WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 CAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Authorized Service Centers. . . . . . . . . . . . . . . . . . . . . .
7.3 Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 7.3.1 7.3.2 7.4 Scan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Scan Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Temperature Display Hold . . . . . . . . . . . . . . . . . . . . . 25 7.4.1 7.4.2 7.4.3 7.4.4 Hold Temperature Display Mode Setting . . . . . . . Switch Wiring . . . . . . . Switch Test Example . . . . . . . . . . . . . . . . . . . . . . .
10.2.3 Accuracy & Repeatability. . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 11 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 12 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . 49 12.1 12.2 Troubleshooting Problems, Possible Causes, and Solutions . . . . 49 CE Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 12.2.1 12.2.2 EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figures and Tables Table 1 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Table 2 Table 2 Figure 7 Figure 8 iv International Electrical Symbols . . . . . . . . . . . . . . . . . . . . . 1 Heat shield installed on 9141calibrator . . . . . . . . . . . . . . . . . . 5 9141 Back Panel and Bottom . . . . . . . . . . . . . . . . . . . . . . 15 9141 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Inserts available for the 9141 block assembly . . . . . . . . . . . . . .
1 Before You Start Symbols Used 1 1.1 Before You Start Symbols Used Table 1 lists the International Electrical Symbols. Some or all of these symbols may be used on the instrument or in this manual.
9141 Dry-well Calibrator User’s Guide Symbol Description Canadian Standards Association OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1 refers to the level of Impulse Withstand Voltage protection provided. Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from the fixed installation. Examples include household, office, and laboratory appliances.
1 Before You Start Safety Information ing power such as storage in a low humidity temperature chamber operating at 50°C for 4 hours or more. • DO NOT use this instrument for any application other than calibration work. The instrument was designed for temperature calibration. Any other use of the instrument may cause unknown hazards to the user. • Completely unattended operation is not recommended. • Overhead clearance is required. DO NOT place the instrument under a cabinet or other structure.
9141 Dry-well Calibrator User’s Guide into a 115 VAC, 60Hz (230 VAC, 50Hz optional), AC only electric outlet. The power cord of the instrument is equipped with a three-pronged grounding plug for your protection against electrical shock hazards. It must be plugged directly into a properly grounded three-prong receptacle. The receptacle must be installed in accordance with local codes and ordinances. Consult a qualified electrician. DO NOT use an extension cord or adapter plug.
1 Before You Start Safety Information does not prevent all heat from reaching the hub. Be careful when removing the heat shield or the probe from the well. Figure 1 Heat shield installed on 9141calibrator • DO NOT apply any type of voltage to the display hold terminals. Applying a voltage to the terminals may cause damage to the controller. • DO NOT use fluids to clean out the well. Fluids could leak into electronics and damage the instrument.
9141 Dry-well Calibrator User’s Guide • DO NOT operate this instrument in an excessively wet, oily, dusty, or dirty environment. Always keep the well and inserts clean and clear of foreign material. • The dry-well is a precision instrument. Although it has been designed for optimum durability and trouble free operation, it must be handled with care. Always carry the instrument in an upright position to prevent the probe sleeves from dropping out.
1 Before You Start Authorized Service Centers Room 2301 Sciteck Tower 22 Jianguomenwai Dajie Chao Yang District Beijing 100004, PRC CHINA Phone: +86-10-6-512-3436 Telefax: +86-10-6-512-3437 E-mail: xingye.han@fluke.com.cn Fluke South East Asia Pte Ltd. Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace #03-16 The Comtech (Lobby D) 118502 SINGAPORE Phone: +65 6799-5588 Telefax: +65 6799-5588 E-mail: antng@singa.fluke.
2 Introduction 2 Introduction The Hart Scientific 9141 High-Temp Field Calibrator may be used as a portable instrument or bench top temperature calibrator for calibrating thermocouple and RTD temperature probes. The 9141 is small enough to use in the field, and accurate enough to use in the lab. Calibrations may be done over a range of 50°C to 650°C (122°F to 1202°F). Temperature display of the 9141 is 0.1 degrees.
3 Specifications and Environmental Conditions Specifications 3 3.1 3.2 Specifications and Environmental Conditions Specifications Power 115 VAC (±10%), 50–60 Hz, 1000 Watts and 230 VAC (±10%), 50–60 Hz, switchable Ambient Temperature 5–50°C(41–121°F) Operating Range 50–650°C (122–1202°F) Resolution 0.1°C or °F resolution Readout Switchable °C or °F Accuracy ±0.5°C up to 400°C, ±1°C 400°C to 650°C, ±2°C for holes greater than 6.5 mm (0.25") Stability ±0.05°C at 100°C, ±0.12°C at 500°C, ±0.
9141 Dry-well Calibrator User’s Guide • altitude does not effect the performance or safety of the unit 3.3 Warranty Fluke Corporation, Hart Scientific Division (Hart) warrants this product to be free from defects in material and workmanship under normal use and service for a period as stated in our current product catalog from the date of shipment.
4 Quick Start Unpacking 4 4.1 Quick Start Unpacking Unpack the dry-well carefully and inspect it for any damage that may have occurred during shipment. If there is shipping damage, notify the carrier immediately. Verify that the following components are present: • 9141 Dry-well • 3141-2, Insert A • Power Cord • Manual • Report of Calibration • Calibration Label • Heat Shield • 9930 • RS-232 Cable • Insert Removal Tool 4.
9141 Dry-well Calibrator User’s Guide The display will begin to show the well temperature and the well heater will start operating to bring the temperature of the well to the set-point temperature. 4.3 Power Plug the dry-well power cord into a mains outlet of the proper voltage, frequency, and current capability. Typically this will be 115 VAC (±10%), 50/60 Hz (230 VAC (±10%), 50/60 Hz). Turn the dry-well on using the rear panel “POWER” switch.
5 Parts and Controls Bottom Panel 5 Parts and Controls The user should become familiar with the dry-well calibrator and its parts. 5.1 Bottom Panel Figure 2 on page 15. Power Cord - Underneath the calibrator is the removable power cord inlet that plugs into an IEC grounded socket. Power Switch - The power switch is located on the power entry module (PEM). The PEM also houses the fuses and the dual voltage selector.
9141 Dry-well Calibrator User’s Guide Heater Voltage Switch - To be used only when changing the input voltage. (See Section 6.2 for instructions on changing the input voltage.) NOTE: The input voltage and heater voltage switch settings should always be the same value. Serial Port - A DB-9 male connector is present for interfacing the calibrator to a computer or terminal with serial RS-232 communications.
5 Parts and Controls Constant Temperature Block Assembly Controller Keypad - The four button keypad allows easy setting of the set-point temperature. The control buttons (SET, DOWN, UP, and EXIT) are used to set the calibrator temperature set-point, access and set other operating parameters, and access and set calibration parameters. Setting the control temperature is done directly in degrees of the current scale. It can be set to one-tenth of a degree Celsius or Fahrenheit.
9141 Dry-well Calibrator User’s Guide CAUTION: The block vent cover may be very hot due to the fan blowing upward. Please use caution. 5.3.2 Probe Sleeves and Tongs The calibrator is supplied with a multi-hole aluminum-bronze probe sleeve for insertion into the calibrator well and tongs for removing sleeves. Probe sleeves of various hole sizes are available to allow the user’s probe to fit snugly into the well whatever the diameter of the probe.
6 General Operation Changing Display Units 6 6.1 General Operation Changing Display Units The 9141 can display temperature in Celsius or Fahrenheit. The temperature units are shipped from the factory set to Celsius. To change to Fahrenheit or back to Celsius there are two ways: 1 - Press the “SET” and “UP” simultaneously. This will change display units. 2 - Press the “SET” key three times from the temperature display to show Un= C Press the “UP” or “Down” key to change units.
7 Controller Operation Well Temperature 7 Controller Operation This chapter discusses in detail how to operate the dry-well temperature controller using the front control panel. Using the front panel key-switches and LED display the user may monitor the well temperature, set the temperature set-point in degrees C or F, monitor the heater output power, adjust the controller proportional band, and program the calibration parameters, operating parameters, and serial interface configuration.
9141 Dry-well Calibrator User’s Guide Figure 5 Controller Operation Flowchart 22
7 Controller Operation Temperature Set-point 100.0 C S Well temperature in degrees Celsius Access set-point memory 1. 100. Set-point memory 1, 100°C currently used To change to another set-point memory press “UP” or “DOWN”. 4. 300. New set-point memory 4, 300°C Press “SET” to accept the new selection and access the set-point value. S 7.2.2 Accept selected set-point memory Set-point Value The set-point value may be adjusted after selecting the set-point memory and pressing “SET”. 4 200.
9141 Dry-well Calibrator User’s Guide Un= F 7.3 New units selected Scan The scan rate can be set and enabled so that when the set-point is changed the dry-well heats or cools at a specified rate (degrees per minute) until it reaches the new set-point. With the scan disabled the dry-well heats or cools at the maximum possible rate. 7.3.1 Scan Control The scan is controlled with the scan on/off function that appears in the main menu after the temperature scale units.
7 Controller Operation Temperature Display Hold 7.4 Temperature Display Hold The 9141 has a display hold function which allows action of an external switch to freeze the displayed temperature and stop the set-point from scanning. This is useful for testing thermal switches and cutouts. This section explains the functions available for operating the temperature hold feature. An example follows showing how to set up and use the hold feature to test a switch. 7.4.
9141 Dry-well Calibrator User’s Guide sistor. The calibrator measures the voltage at the red terminal and interprets +5V as open and 0V as closed. 7.4.4 Switch Test Example This section describes a possible application for the temperature hold feature and how the instrument is set up and operated. Suppose you have a thermal switch which is supposed to open at about 75°C and close at about 50°C and you want to test the switch to see how accurate and repeatable it is.
7 Controller Operation Proportional Band the percent heater power will let the user know how stable the well temperature is. With good control stability the percent heating power should not fluctuate more than ±1% within one minute. The heater power display is accessed in the secondary menu. Press “SET” and “EXIT” simultaneously and release. The heater power will be displayed as a percentage of full power. 100.0 C S+E SEC 12.
9141 Dry-well Calibrator User’s Guide Press “SET” and “EXIT” to enter the secondary menu and show the heater power. Then press “SET” to access the proportional band. S+E Flashes for secondary menu and then displays the heater power SEC 12.0 P S Access heater power in secondary menu Heater power in percent Access proportional band Proportional band setting 4.1 ProP Flashes and then displays the value To change the proportional band press “UP” or “DOWN”. 10.
7 Controller Operation Operating Parameters the user may restore these values to the factory settings. The user should have a list of these constants and their settings with the instrument manual. WARNING: DO NOT change the values of the instrument calibration constants from the factory set values. The correct setting of these parameters is important to the safety and proper operation of the instrument.
9141 Dry-well Calibrator User’s Guide ture. The factory default and maximum are set to 650°C. For safety, a user can adjust the HL down so the maximum temperature set-point is restricted. HL High Limit parameter Press “SET” to enable adjustment of HL H=650 Current HL setting Adjust the HL parameter using “UP” or “DOWN”. H=400 New HL setting Pres “SET” to accept the new temperature limit. 7.
7 Controller Operation Serial Interface Parameters Press “SET” to set the baud rate to the new value or “EXIT” to abort the operation and skip to the next parameter in the menu. 7.11.2 Sample Period The sample period is the next parameter in the serial interface parameter menu. The sample period is the time period in seconds between temperature measurements transmitted from the serial interface.
9141 Dry-well Calibrator User’s Guide ASCII 10) after transmission of any carriage-return. The linefeed parameter is indicated by, LF Serial linefeed parameter Press “SET” to access the linefeed parameter. LF= On Current linefeed setting The mode may be changed using “UP” or “DOWN” and pressing “SET”.
8 Digital Communication Interface Serial Communications 8 Digital Communication Interface The dry-well calibrator is capable of communicating with and being controlled by other equipment through the digital serial interface. With a digital interface the instrument may be connected to a computer or other equipment. This allows the user to set the set-point temperature, monitor the temperature, and access any of the other controller functions, all using remote communications equipment.
9141 Dry-well Calibrator User’s Guide ary menu. Press “SET” repeatedly until the display reads “CAL”. Press “UP” until the serial interface menu is indicated with “SErIAL”. Finally press “SET” to enter the serial parameter menu. In the serial interface parameters menu are the BAUD rate, the sample rate, the duplex mode, and the linefeed parameter. 8.1.2.1 Baud Rate The baud rate is the first parameter in the menu. The display will prompt with the baud rate parameter by showing “bAUd”.
8 Digital Communication Interface Interface Commands temperature set-point and view or program the various parameters. The interface commands are discussed in Section . All commands are ASCII character strings terminated with a carriage-return character (CR, ASCII 13). 8.2 Interface Commands The various commands for accessing the calibrator functions via the digital interfaces are listed in this section (see Table 2). These commands are used with the RS-232 serial interface.
9141 Dry-well Calibrator User’s Guide Table 2 9141 controller communications commands Command Description Command Format Command Example Returned Returned Example set: 9999.99 {C or F} set: 150.00 C Acceptable Values Display Temperature Read current set-point s[etpoint] s Set current set-point to n s[etpoint]=n s=350 Read temperature t[emperature] t t: 9999.9 {C or F} t: 55.
8 Digital Communication Interface Interface Commands 9141 communication commands continued Command Description Command Format Command Example Returned Returned Example sa: 9 sa: 1 Acceptable Values Serial Interface Menu Read serial sample setting sa[mple] sa Set serial sampling setting to n seconds sa[mple]=n sa=0 Set serial duplex mode: du[plex]=f[ull]/h[alf] Set serial duplex mode to full du[plex]=f[ull] du=f Set serial duplex mode to half du[plex]=h[alf] du=h Set serial linefeed m
9 Test Probe Calibration Calibrating a Single Probe 9 Test Probe Calibration For optimum accuracy and stability, allow the calibrator to warm up for 10 minutes after power-up and then allow adequate stabilization time after reaching the set-point temperature. After completing operation of the calibrator, allow the well to cool by setting the temperature to 100°C for one-half hour before switching the power off. 9.
9141 Dry-well Calibrator User’s Guide Inserting a cold probe into a well will require another period of stabilizing depending on the magnitude of the disturbance and the required accuracy. For example, inserting a .25 inch diameter room temperature probe into a sleeve at 300°C will take 5 minutes to be within 0.1°C of its settled point and will take 10 minutes to achieve maximum stability. Speeding up the calibration process can be accomplished by knowing how soon to make the measurement.
9 Test Probe Calibration Dry-well Characteristics Block Temperature °C 600 500 400 300 200 100 Ambient 2 4 6 8 10 12 Time in Minutes Figure 7 Typical Heating Rate Block Temperature °C 650 540 430 320 210 100 Ambient 4 8 12 16 20 24 Time in Minutes Figure 8 Typical Cooling Rate 41
10 Calibration Procedure Calibration Points 10 Calibration Procedure Sometimes the user may want to calibrate the dry-well to improve the temperature set-point accuracy. Calibration is done by adjusting the controller probe calibration constants R0 , ALPHA, and DELTA so that the temperature of the dry-well as measured with a standard thermometer agrees more closely with the set-point.
9141 Dry-well Calibrator User’s Guide T ⎤ ⎡ T ⎤⎡ T ⎤ ⎡ T ⎤⎡ C = ⎢ 3 ⎥⎢1 − 3 ⎥ − ⎢ 2 ⎥⎢1 − 2 ⎥ ⎣100 ⎦⎣ 100 ⎦ ⎣100 ⎦⎣ 100 ⎦ T ⎤ ⎡ T ⎤⎡ T ⎤ ⎡ T ⎤⎡ D = ⎢ 2 ⎥⎢1 − 2 ⎥ − ⎢ 1 ⎥⎢1 − 1 ⎥ 100 100 100 100 ⎣ ⎦⎣ ⎦ ⎣ ⎦⎣ ⎦ E = R3 − R2 F = R2 − R1 delta = AF − BE DE − CF T1-3 - Measured temperature using thermometer. R1-3 - Value of R from display of 9141 (Press SET and DOWN at the same time.) where T1 and R1 are the measured temperature and resistance at 50.
10 Calibration Procedure Calibration Procedure b. Press SET then use the UP or DOWN keys until the correct numerical setting is displayed. Press SET to accept the new value. c. Repeat step b for ALPHA and DELTA. 10.2.3 Accuracy & Repeatability 1. Check the accuracy of the dry-well at various points over the calibrated range. 2. If dry-well does not pass specification at all set-points, repeat the Calibration Procedure.
11 Maintenance 11 Maintenance • The calibration instrument has been designed with the utmost care. Ease of operation and simplicity of maintenance have been a central theme in the product development. Therefore, with proper care the instrument should require very little maintenance. Avoid operating the instrument in an oily, wet, dirty, or dusty environment. • If the outside of the instrument becomes soiled, it may be wiped clean with a damp cloth and mild detergent.
12 Troubleshooting 12 Troubleshooting This section contains information on troubleshooting, CE Comments, and a wiring diagram. 12.1 Troubleshooting Problems, Possible Causes, and Solutions In the event that the instrument appears to function abnormally, this section may help to find and solve the problem. Several possible problem conditions are described along with likely causes and solutions. If a problem arises, please read this section carefully and attempt to understand and solve the problem.
9141 Dry-well Calibrator User’s Guide Unstable display Wait. Allow the instrument to stabilize for a few minutes. Proportional band may be incorrect. Refer to the proportional band on the Report of Calibration. Electrical Noise. If the unit is being used in the field, take it to a different location (calibration lab) to see if the display becomes stable. If the display is stable in the new location, there may be electrical noise generated by equipment in the field interfering with the control.
12 Troubleshooting CE Comments 12.2.2 Low Voltage Directive (Safety) In order to comply with the European Low Voltage Directive (73/23/EEC), Hart Scientific equipment has been designed to meet the IEC 1010-1 (EN 61010-1) and the IEC 1010-2-010 (EN 61010-2-010) standards.
