Related Manuals for Omega 865
Summary of Contents for Omega 865
- Page 1 User’s Guide ® http://www.omega.com e-mail: info@omega.com Model 865 and 866 Digital Thermometers...
- Page 2 Toll Free in England: 0800-488-488 e-mail: uk@omega.com It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
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Page 3: Table Of Contents
Model 865........ -
Page 4: Section 1 Introduction
9 V battery. Continuous operation of 350 hours is typical with an alkaline battery or 200 hours typical with a carbon-zinc battery. The Model 865 measures temperatures on two ranges. The 300°F range measures temperature from –70°F to 300°F with a resolution of 1°F. The 200°... -
Page 5: Preparation For Use
PREPARATION FOR USE The Models 865 and 866 are ready for use, after the battery is installed. To install the battery, refer to paragraph 5.2.3. VERIFICATION CHECK Install a probe and, at room temperature, hold the tip of the probe between your thumb and index finger. -
Page 6: Model 866
Figure 3-1 Model 865 Control Layout 3.2.2 Model 866 (See Figure 3-2) 1. Turn power on. Turning power on also selects the 150°C measurement range. 2. Insert appropriate temperature probe into the input jack. 3. Touch the probe tip to the material to be measured and read the display in degrees Celsius. -
Page 7: Section 4 Theory Of Operation
Figure 3-2 Model 866 Control Layout SECTION 4 THEORY OF OPERATION The temperature sensor is thermistor based. The thermistor sensor is a negative temperature coefficient device. This means that as the temperature increases, the resistance of the thermistor decreases. This relationship is a logarithmic func- tion. - Page 8 REF LO on U102 by way of C106 and U103B (see Schematic Diagram 866-106 or 865-106). The voltage that is applied to the input of U104A and across C111 is the difference between the output voltage of U104C and the voltage that was charged on C106 during the signal phase.
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Page 9: Section 5 Service Information
Figure 4-2 Zero Phase SECTION 5 SERVICE INFORMATION PERFORMANCE ACCURACY CHECK 1. Set up the equipment as shown in Figure 5-1. 2. Follow Table 5-1 to verify instrument performance. NOTE The LO of the resistance box must be connected to the LO (sleeve) of the / phone jack. -
Page 10: Disassembly
Table 5-1 PERFORMANCE VERIFICATION MODEL 865 Step Setting Decade Resistance Allowable Reading 200°F 75,750 ohms –39.4 to –40.6 200°F 255,700 ohms –68.8 to –71.2 200°F 19,220 ohms –00.5 to 00.5 200°F 220.8 ohms 188.9 to 191.1 300°F 43 ohms 298 to 3021... -
Page 11: 5.2.2 Disassembly Instructions
4. Remove the standoff that secures the PC board to the case. (It is located in the center of the PC board.) 5. Remove the switch cover for the Model 866 and for the Model 865. 6. Lift the PC board out of the top cover (front panel). CAUTION When removing the LCD from the PC board, be careful not to spread the four retaining hooks on the clear plastic bezel too far. - Page 12 Figure 5-2 Models 865 and 866 Exploded View WARNING When reassembling the instrument, be sure to reinstall the switch cover. Common-mode voltage may be present on the switch, creating a hazard if the cover is not reinstalled.
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Page 13: Battery Replacement
23°C 3°C and a relative humidity of less than 80%. Use the following procedure to calibrate either Model 865 or Model 866. To locate the adjustment points, remove the bottom cover. See Figure 5-3 above. -
Page 14: Troubleshooting
Likewise, the troubleshooting section is a guide only and cannot cover all possible con- tingencies that may occur. Each Model 865 and 866 is covered by a 12-month warranty as described on the inside front cover of this manual. Warranty will be void if the unit shows evidence of... -
Page 15: Dc Voltage Checks
Use the following formula to calculate the display reading. 1. Place a stable input to the instrument under test. For example, 190°F for the Model 865 and 150°C for the Model 866. NOTE All the measurements in steps 2 through 5 are referenced to analog common. -
Page 16: Waveform Checks
5.4.3 WAVEFORM CHECKS Using a precision oscilloscope, make the following waveform checks in Table 5-5: TABLE 5-5 WAVEFORM CHECKS Step Item/Component Waveform (Referenced to analog ground) U102 pin 40 (OSC 1) U102 pin 39 (OSC 2) U102 pin 38 (OSC 3) (Same as step 2.) U102 pin 27 (INTEGRATOR) (with negative full-scale... -
Page 17: Section 6 Specifications
SECTION 6 SPECIFICATIONS MODEL 865 TEMPERATURE SENSOR TYPE: Thermistor (2252 Ohm @ 77°F) RANGE TEMPERATURE ACCURACY* SPAN RESOLUTION 65° TO 82°F; 1 year 200°F – 40.0° to 199.9° 0.1° (0.3% rdg + 0.5°F) – 70.0° to – 40.1° 0.1° (0.3% rdg + 1.0°F) 300°F... - Page 18 From –10° to 18° and 28 ° to 50° C: less than (0.06% rdg + 0.01° C)/° C. SENSOR VOLTAGE: 40 mV RMS maximum. MODEL 865 AND 866 GENERAL SPECIFICATIONS (unless specified): DISPLAY: ⁄ -digit LCD O.5" (13 mm) height. Polarity and decimal point indication.
- Page 19 Heavy duty ABS plastic housing. OPTIONAL ACCESSORIES Any OMEGA thermistors with 2252 ohms are suitable. See the ON series or the THX series in the latest OMEGA Temperature Measurement Handbook. Model 8660 Tilt/Stand/Belt Clip/Probe Holder—for the Model 865 or 866. Model 8668 Soft Carrying Case is a padded vinyl carrying case that holds one hand held meter, a Model 8660 and a probe.
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Page 20: Parts List And Component Layout
PARTS LIST FOR MODELS 865 AND 866 SCHEMATIC SCHEMATIC DESIG. DESCRIPTION LOCATION BA101 9V Alkaline Battery, NEDA 1604 C101 Capacitor, 0.047, 50V Metalized Polypropylene µ F, 50V Ceramic C102 Capacitor, 0.1 C103 Capacitor, 0.1 µ F, 50V Ceramic C104 Capacitor, 0.33 µ F, 63V Metalized Polyester C105 Capacitor, 0.33 µ... - Page 21 MODEL 865 AND 866 PARTS LIST (continued) U101 Triple 2 Channel Analog Multiplexer, 4053 U102 ⁄ Digit Low Power A/D converter, ICL7136CPL U103 Triple 2 Channel Analog Multiplexer, 4053 U104 Quad Low Power J-FET, LF44CN U105 Current Source, LM334 VR101 6.2V, Zener Diode, 1N753...
- Page 24 Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, includ- ing but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification.
- Page 25 Where Do I Find Everything I Need for Process Measurement and Control? OMEGA…Of Course! TEMPERATURE Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies Wire: Thermocouple, RTD & Thermistor Calibrators & Ice Point References Recorders, Controllers & Process Monitors Infrared Pyrometers PRESSURE, STRAIN AND FORCE Transducers &...