User’s Guide MADE IN 305.4 °F ® 450 AET THERMOCOUPLE THERMOMETER TYPE E Shop online at ON °F HOLD www.omega.com e-mail: info@omega.com 1° 0.
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Table of Contents Section 1: Description 1.1 General Description……………2 1.2 Physical Description…………...3 1.3 Unpacking……………………… 3 1.4 Specification…………………… 4 Section 2: Operation 2.1 Principles of Operation………...7 2.2 Power…………………………… 8 2.3 Operation……………………….10 2.4 Maintenance……………………13 Section 3: Calibration 3.
Section 1 Description 1.1 General Description Your hand-held, battery operated digital temperature indicator is configured for compatibility with one of five temperature transducers, J,K,E,T RTD and Thermister. Each of the configurations linearizes the analog output from the transducer to produce a stable and accurate digital temperature display. Plug-in type input connectors are used for the transducer input to provide quick connect and disconnect capability.
1.2 Physical Description The indicator measures 45 mm (1.8 inches) in Height, 85 mm (3.3 inches) in width, and 145 mm (5.7 inches) in length. Weight is 230 grams (8.0 ounces). The case is constructed of high impact plastic. 1.3 Unpacking The indicator is supplied with the battery installed. A quick electrical test should be performed to verify that the indicator is operative. See 2.3 in Section 2 for operating instructions.
Specifications Display: Liquid crystal display, 7.6 mm (0.3 in.) digit Height Operating temperature: 0 to 50°C (32 to 122°F) 0 to 75% Relative Humidity Storage Temperature: -20 to 70°C (-4 to 158°F) Battery: NEDA 1604, 9 Volt Battery Life: Thermocouple-2000 hours minimum Platinum RTD-500 hours minimum Thermistor- 1200 hours minimum NMRR: 50 dB @ 50±1 Hz, 0.1° range 35 dB @ 50±1 Hz or 60±1Hz, 1° range CMRR: 140 dB @ 50±1 Hz, 0.
Maximum Common Mode Voltage: 1000VAC(RMS), ±2000V Peak Accuracy at 22°C (72°F) 1° range: ±0.8°C±0.1% rdg ±1.5°F±0.1% rdg ±0.25°C±0.1% rdg ±.45°F±0.1% rdg 0.1° range: Stability with time: 90 days: 1 year: add ±0.05% rdg. add ± 0.1% rdg. Stability with temperature: Thermocouple: zero: ±0.03°C/°C span: ±0.02% rdg/°C (max) reference junction tracking ±1.0°C (±1.8°F) from 5°C to 45°C (41°F to 113°F) Platinum RTD: ±0.02°C, ±0.01% rdg/°C Thermistor: positive- ±0.02°C/°C negative-±0.
450 Range Table Type K Type J Type E Type T -189 C to +1372 C -308 F to +2501 F -139.8 C to +203.7 C -219.7 F to +398.7 F -194 C to +1200 C -318 F to +2192 F -117.4 C to +203.5 C -179.4 F to +398.7 F -212 C to +1000 C -351 F to +1832 F -137.2 C to +203.5 C -215.0 F to +398.4 F -217 C to +400 C -360 F to +752 F -148.2 C to +203.9 C -234.8 F to +399.0 F -233 C to +904 C -388 F to +1660 F -102.9 C to +203.5 C -153.2 F to +398.3 F -25.7 C to +103.2 C -14.4 F to +217.8 F 1 0.1 1 0.1 1 0.1 1 0.1 1 RTD 0.
Section 2 Operation 2.1 Principles of Operation The temperature indicator uses two ICs to digitize and display the analog input signal. One IC performs the conversion of the analog input to the digital equivalent via 24 bit deltasigma analog to digital converter. Battery voltage is also monitored by this IC and a thermistor supplies the reference junction correction signal. The other IC receives input from the analog to digital converter, linearizes and drives the LCD display.
2.2 Power When battery voltage reaches about 6 volts, the display will exhibit a flashing: “LOW BAT” indication. A minimum of 20 hours of operation time remains upon initial appearance of the “LOW BAT” indication. When the battery voltage drops below 5 volts, an overload indications of three columns of dashes will appear on the display in addition to the flashing “LOW BAT” symbol. The indicator uses a NEDA 1604 (or equivalent) 9 Volt battery.
the recesses or each corner of the case bottom. Step 2: Carefully pull the case halves straight apart so as not to damage the internal connectors. Step 3. Install the new battery. Close the case and reinstall the four screws.
2.3 Operation Step 1: Insert temperature sensor plug into the indicator input jack. Failure to insert a probe results in a overload condition of three columns of dashes showing on the display. Step 2: Turn the indicator ON by pressing the °F or °C key. The display can be switched to read the temperature in degrees Celsius or Fahrenheit without affecting calibration. Step 3: Select the display range of 1° (wide range, low resolution) or 0.1° (narrow range, high resolution) with the 1°/0.1° key.
Step 5: Observe and or record the temperature value. Step 6: Turn instrument off by pressing the OFF key.
Low Battery Voltage Indication Probe Input Jack Display Value F/C Indication F C To Hold Display Press and hold key to retain last reading on the display. 450 SERIES ON F . HOLD 1 0.1 Press this key to turn OFF ON C .
2.4 Maintenance Normal maintenance of the indicator consists of occasional cleaning with a soft, damp cloth, replacement of the battery as required, and calibration as outlined in Section 3.
Section 3 Calibration 3.1 Calibration Units with serial numbers beginning with the letter N use the calibration procedure outlined below. Older units do not display version numbers and use the calibration procedures on page 19 . The calibration procedure should be performed by a qualified instrumentation service technician. The indicator may be brought to any instrumentation calibration and repair laboratory (metrology lab) for the service (this manual should accompany the instrument).
with a minimum accuracy of ±0.1 degree Fahrenheit or ±0.2 degree Centigrade. Step 1. Ensure the unit is turned off. Connect the output of the thermocouple simulator to the input of the indicator using the appropriate thermocouple wire. Set the simulator output to 0°C Step 2. Locate the calibration switch on the back of the case labeled “Zero”. Remove the black button. Using a small screw drive or flat end of the trimmer pot, press the cal switch once.
NOTE: If you want to cancel the calibration mode press OFF button in front of the unit. For T/C type K set simulator @ 1320 °C J set simulator @ 960 °C T set simulator @ 350 °C E set simulator @ 950 °C Press the switch one more time and wait for a few seconds until display switches to 0.0 set simulator to 0°C. Press switch one more time. Unit should shut-off. Step 4. Now, turn the unit on from front panel. Make sure the unit in degree C mode.
calibration procedure, set simulator at .2°C instead of 0 °C. Repeat the calibration procedure again. Step 6. Verify calibration once finished.
Ra Rb Rc GND Ref J +IN -1.23V +3.7V 10 2 5 1 6 3 8 9 4 7 Ra - Full Scale Adj. Rb Zero Adj. Rc +Full Scale Adj.
Calibration- Thermocouple Type K, J and T and E Equipment List • • • • 4 ½ digit voltmeter Voltage Calibrator: Resolution, 1uV; accuracy ±0.01% (±2uV) Ice Bath, 0.00 °C ± 0.05°C Jumper lead terminated in mini-clips For optimum results, the calibration should be performed with an ambient temperature from 20° 24°C (68° to 75°F). Refer to the figure on the previous page for the locations of all testpoints and adjustments. a. Turn the indicator ON by pressing the °C key. b.
c. d. Remove the bottom case of the indicator. Adjust the voltage calibrator for an output of 0.000mV and connect the minus lead from the calibrator to “GND” and the positive lead from the calibrator to “;+IN”, on the indicator printed circuit board. e. Disable the reference junction by jumpering together the “REF J” and “GND” testpoints, using a jumper lead terminated in mini-clips. f. Adjust Rb for an indicator display of 0.0°C. g.
polrity). j. The voltage measured at the “3.7V” testpoint should be 3.007 times larger than the voltage measured at the “-1.23V” testpoint. Adjust Rc (which varies the +3.7V line to attain the proper ratio. k. Switch the indicator to the 1° range. l. Adjust the voltage calibrator for an output of +53.782mV for type K; +57.942mV for type J; +75.983mV for type E; +18.824mV for type T; m.
Calibration- Thermistor Type Equipment List • • • • 4 ½ digit voltmeter Precision decade box: Resolution, 0.01 ohm ; accuracy ±0.02% Ice Bath, 0.00 °C ± 0.05°C Electro Scientific Industries DB-62 or equivalent a. Turn the indicator ON by pressing the °C key. b. Remove the bottom case of the indicator. c. Connect a precision resistance box to the terminals on the phone input jack; set the resistance box to 7,280 ohms. d. Connect the DVM LO lead to “GND”, on the indicator printed circuit board. e.
at the “-1.23V” testpoint: disregarding polarity indication, record the voltage. f. Move the DVM HI lead to the “3.7V” testpoint and record the voltage (disregard polarity). g. The voltage measured at the “3.7V” testpoint should be 3.007 times larger than the voltage measured at the “-1.23V” testpoint. Adjust Rc (which varies the +3.7V line to attain the proper ratio. h. Adjust Rb for an indicator display of 0.2°C. i. Set the resistance box to 148.4 ohms. j.
Calibration- Platinum RTD Equipment List • • • • • 4 ½ digit voltmeter Precision decade box: Resolution, 0.01 ohm ; accuracy ±0.02% Ice Bath, 0.00 °C ± 0.05°C Electro Scientific Industries DB-62 or equivalent a. Turn the indicator ON by pressing the °C key. b. Remove the bottom case of the indicator. c. Connect a precision resistance box to the terminals on the RTD input jack and set the resistance box to 100.04 ohms. d. Using HI lead of DVM, measure voltage at the “-1.
e. Move the DVM HI lead to the “3.7V” testpoint and record the voltage (disregard polrity). f. The voltage measured at the “3.7V” testpoint should be 3.007 times larger than the voltage measured at the “-1.23V” testpoint. Adjust Rc (which varies the +3.7V line to attain the proper ratio. g. Adjust Rb for an indicator display of 32.2°F. h. Adjust Ra for an indicator display of +196.0°C. i. Reassemble the indicator.
Zero Calibration a. Turn the indicator on by pressing the °C key. b. Set the indicator to the 0.1° range. c. Connect the ice bath probe to the indicator Input jack. d. Place the probe in a stable ice bath (0.00C ±0.05°C and adjust the ZERO pot (Rb) located beneath the plug on the rear case for an indicator display of 0.0°C. e. Replace the rubber plug. Calibration is complete.
WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA’s Warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product. If the unit malfunctions, it must be returned to the factory for evaluation.
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