Altek Model 222A SingleType Thermocouple Calibrator Manual
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Thermocouple Calibrator Model 222A • Select one of 10 T/C types plus mVJ, K, T, E, R, S, B, N, C, L & mV • Temperature input & outputReads directly in degrees • Quik-Chek™ switchInstantly recall three outputs; HI, LO & Set • Multi-speed digital potFast, accurate setting • Accuracy ±(0.008% of reading+0.006 mV)Typical accuracy of 0.4°C or 0.7°F Field selectable 0.1° or 1µV resolutionCalibrate thermocouple instruments Source and read T/C’s over the entire industrial tem- perature range with Altek’s Model 222A Thermocouple Calibrator. Use with transmitters, recorders, control- lers, alarms, indicators, data acquisition and computer systems. Built-in flexible T/C leads let you connect directly using the proper T/C materials. Automatic, linearized cold junction compensation virtually eliminates temperature drift. Field customize the Model 222A to lock-in 0.1° or 1° resolution, fixed °F or °C or front panel selectable °F/°C operation. Built in protection guards the Model 222A against mis-connection to 120 Volts AC or DC, in any mode. Calibrate thermocouple inputs Select resolution of 0.1° or 1° for the full listed range of all thermocouple types. Millivolts allows 10 microvolt resolution from -999.90 to 999.90 mV. The Model 222A simulates key temperatures for repetitive calibrations. “Quik-Chek” function stores three output temperatures for real convenience. Three memories are retained for each thermocouple type even when the power is off. Turn the knob to check trip points, controller action or hysteresis. The fast response 222A sets quickly without overshoot but allows slow changes at your own rate. Measure thermocouple sensors The Model 222A display gives you fast, accurate temperature measurement with 0.1 and 1 degree or with 0.01 millivolt resolution. High resistance or open T/Cs and leads are detected and indicated on the LCD display. Two readings per second track fast moving temperatures. “MAX” and “MIN” memories are continuously updated from turn-on or whenever the “RESET” pushbutton is pressed. The Model 222A gives you a handy tool to monitor temperatures for drift or control deviation. Just flip the “Quik-Chek” switch to display the minimum and maximum temperature since reset. Turn-on sequence Each time the Model 222A is turned on, the LCD will display all segments for 1 second. If °C/°F operation has been selected the currently selected temperature scale of °C or °F will display. General description
General instructions Setting operating mode Turn-onEach time the Model 222A is turned on, the LCD will display all segments for about 1 second. It then dis- plays the currently selected thermocouple type for approximately 3 seconds. The currently selected temperature scale of °C or °F will then display for about 3 seconds. 1) Move the power switch to SOURCE or READ 2) All segments on the LCD are turned on during self test 3) The display will indicate the selected temperature scale for 3 seconds. Press the SCROLL pushbutton to switch between °C & °F (based on configuration). If fixed °C or fixed °F have been selected, the user prompts for this selections will be skipped. The three “QUIK-CHEK” temperature values will be the same as previously stored. Each time a different T/C type is selected, the three “QUIK-CHEK” values for that type will be recalled. Changing the batteryLow battery is indicated by BAT on the LCD display. Approximately 10 hours of operation remain before the LCD goes blank and the Model 222A shuts itself down. Turn the 222A off, remove the four corner screws and lift the unit out of the case. The battery is fastened to the bottom printed circuit board and is easily removed. Replace screws and turn on when ready to use. Initial setupThe Model 222A is internally configurable for ease of use. Simply remove the four corner screws, flip a few DIP switches and follow the simple instructions given below (a condensed guide is found within the calibrator housing). The choices are based on the type of instruments in your shop or plant. For instance if your plant has only instruments that display to 1°C, choose full time °C and display with 1° resolution. Configuring temperature scalesThe Model 222A may be internally set-up for full time use of °C, full time use of °F or selectable °C/°F op- eration. The selectable mode lets you choose °C or °F each time the unit is turned on (see Setting Operating Mode below). Locking in 1º resolutionThe Model 222A may be internally configured for 0.1° or 1° resolution. Select 1° resolution for less critical applications or 0.1° for increased resolution when necessary. Over range/under rangeOut-of-range temperatures are indicated by OVER and UNDER on the display. If out-of-range is displayed during READ mode check for proper con- nections and T/C type. °F °C 100° 100.0° OVER - 8.8.8.8.8MAX HI LO MINBAT OVER UNDER READ SOURCE°F °C m 9 Volt Setting DIP Switches1) Turn the Model 222A OFF. 2) Remove the 4 corner screws and lift faceplate assembly out of the case. 3) Set the DIP switches for your options as diagrammed. 4 Fixed 1°(Switch Up) Fixed °F 1 4 Fixed 0.1°* Fixed °C 2 4 3 (UNUSED) °C/°F Switchable* *Factory Settings (All switches down)1 3 3 (Switch Down) °F °C Some thermocouple input pyrometers and controllers operate on the D’Arsonval meter movement principle. Millivolts from the thermocouple input drive a low resistance coil directly. For example, a coil may have a typical resistance of 60 ohms. Since the pyrome- ter resistance is so low, resistance of the input thermocouple leads must be taken into account. Pyrometers of this type have fixed or adjustable series resistance which corrects for lead length resistance. To use the Model 222A to drive low resistance loads: 1) Disconnect the sensing thermocouple leads at the thermocouple head. 2) Connect leads from the Model 222A to the extension wires going to the pyrometer, using the screw connectors in the head. (If the sensing thermocouple sheath is within 1/4 to 2 times the length of the Model 222A lead length, the error due to resistance will be negligible). 3) Set the temperatures to be used for calibration per the recommendation of the pyrometer manufacturer.If the thermocouple head cannot be accessed: 1) Determine the installed length of extension wire between the head and the pyrometer. 2) Select thermocouple extension wire of the same type, wire size and length as the installed wire between the head and the pyrometer to make up a calibrating wire. 3) Replace the active thermocouple extension wire with the calibrating wire at the pyrometer terminals. 4) Connect the other ends of the calibrating wire to the Model 222A and calibrate the pyrometer. Note: A resistor of the same ohm value as the wire between the head and the pyrometer may be used in series with one lead instead of a length of calibrating wire. Make certain that both input and output leads to the resistor are the same temperature. SOURCE READ HI SET LOMAX READ MIN STORE RESET SCROLL OFF 1000 THERMOCOUPLE CALIBRATOR ALTEKMODEL 222AT Y P E SOURCE READ HI SET LOMAX READ MIN STORE RESET SCROLL OFF 625 THERMOCOUPLE CALIBRATOR ALTEKMODEL 222AT Y P E600 650 Pyrometer calibration
Simulate a thermocouple Source1) Set up the Model 222A for the correct temperature scale (°C or °F). 2) Disconnect the input wires from the device to be calibrated or checked. 3) Connect the Model 222A to the device to be calibrated, being careful to observe proper polarity and T/C type 4) Adjust the digital pot to the desired output value. OutputWhenever SOURCE mode is selected the word SOURCE will appear on the LCD. To change the output value, turn the speed sensitive digital pot. Turning the pot slowly will cause a gradual change in the output. A faster change will occur when the pot is turned faster. A filter circuit limits response when the pot is turned too fast. This function operates in all three output positions (HI, SET & LO). OFFSOURCE OUTPUT Store1) Switch to HI (or LO). 2) Turn the digital pot to desired value. 3) Press STORE. The LCD will flash once indicating that the value has been stored If a value is in the SET position and you want that value in HI or LO, press and hold the STORE button while moving the switch to HI or LO. The LCD will flash once indicating that the value has been stored. Release the STORE button. Instantly recall temperaturesAny time you need a stored value just throw the Quik-Chek switch. Any value in the T/C range may be stored in HI & LO. The Model 222A remembers the HI, LO and SET values for you with the power on or off. OverloadThe Model 222A will indicate OVER and blank the digits on the display when the output leads have been shorted or when the device being calibrated requires more than 10 mA. Read a thermocouple sensor Read1) Set up the Model 222A for the correct T/C type and temperature scale (°C or °F) 2) Disconnect the wires from the thermocouple to be read or checked. 3) Connect the Model 222A to the sensor, being careful to observe proper polarity & T/C type 4) Display present reading, Maximum or Minimum temperatures Whenever READ mode is selected the word READ will appear on the LCD. The Model 222A can measure temperatures for all T/C types with resolu- tions of 0.1° and 1°. The display is updated twice per second to continuously track fast moving tem- peratures. OFFREAD INPUT STORE RESET SOURCE READ HI SET LOMAX READ MIN STORE RESET SCROLL OFF SOURCE READ HI SET LOMAX READ MIN STORE RESET SCROLL OFF HI SET LOMAX READ MIN SOURCEREAD HI SET LOMAX READ MIN STORE RESET SCROLL OFF SOURCEREAD HI SET LOMAX READ MIN STORE RESET SCROLL OFF MIN/MAXTo read the Maximum or Minimum temperature since INPUT mode was entered, simply switch to MAX or MIN. The value will appear on the LCD along with the word MAX or MIN. The MAX/MIN val- ues are automatically updated and may be viewed at any time without disturbing the other values. Pressing the RESET/SCROLL pushbutton will trans- fer the present temperature into both MAX and MIN and will update them as the measured temperature changes. Open thermocouplesThe Model 222A checks for open or high resistance thermocouples. Open or burned out T/Cs are indi- cated by “— — — — ” on the display. Tempera- tures out of range for the T/C TYPE selected will be indicated by OVER and UNDER on the display. 250 RECEIVER CONTROLLER TRANSMITTER RECORDER SOURCE READ HI SET LOMAX READ MIN STORE RESET SCROLL OFF 250.0 THERMOCOUPLE CALIBRATOR ALTEKMODEL 222AT Y P E SOURCE READ HI SET LOMAX READ MIN STORE RESET SCROLL OFF 25.0 THERMOCOUPLE CALIBRATOR ALTEKMODEL 222AT Y P E 222A-mV (Millivolt Model) 222A-mV (Millivolt Model) Source and Read millivolts to calibrate and checkout recorders, mV transmitters and other millivolt input instruments with the Model 222A-mV. Resolution is 10 microvolts from -999.90 to +999.90mV.
PN 1886564 Rev A April 2002 ©2002 Altek Industries, Inc. Specifications subject to change without notice. All rights reserved. Printed in U.S.A. Altek products are warranted to be free from defects in material and workmanship (excluding fuses, batteries and leads) for a period of three years from the date of shipment. Warranty repairs can be obtained by returning the equipment prepaid to our factory. Products will be replaced, repaired, or adjusted at our option. Altek gives no other warranties, including any implied warranty of fitness for a particular purpose.Also, Altek shall not be liable for any special, indirect, incidental or consequential damages or losses arising from the sale or use of its products. Warranty (Unless otherwise indicated, specifications are in % Span@ 23° C) GeneralAccuracy: ±(0.016% of reading + 0.006 mV) Cold junction compensation: Built-in for specified thermocouple type, characterized to T/C curve Cold junction temperature effect: Within 0.05° per °C change in ambient temperature over operating range Operating temperature range: -5 to +140°F (-20 to +60°C) Storage temperature range: -22 to + 175°F (-30 to +80°C) Relative humidity: 10 to 90%, non-condensing Zero stability: Included in cold junction effect Warm up time: 1 minute to full rated accuracy Overload protection: 120 volts AC/DC for 30 seconds on connect- ing leads, in any mode Battery life: 9 Volt Alkaline: Nominal 40 hours Low battery: “BAT” indication on LCD at 7 Volts nominal, approxi- mately 10 hours left. Batteries should be removed when storing the unit >3 months. Specifications Reference drift: