Omega 865, 866 User Manual

®

User’s Guide

http://www.omega.com

e-mail: [e-mail]

Digital Thermometers

Model 865 and 866

omega.com

TM

OMEGA

®

OMEGAnetSMOn-Line Service Internet e-mail

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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.

The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts

no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient connected applications.

TABLE OF CONTENTS

MODEL 865 AND 866 DIGITAL THERMOMETERS

SECTION PAGE

SECTION 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

SECTION 2 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.1 Unpacking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.2 Preparation for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.3 Verification Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

SECTION 3 OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

3.1 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

3.2 Operating Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

3.2.1 Model 865. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

3.2.2 Model 866. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

SECTION 4 THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

SECTION 5 SERVICE INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5.1 Performance Accuracy Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5.2 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5.2.1 Special Handling of Static-Sensitive Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5.2.2 Disassembly Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.2.3 Battery Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5.3 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5.4 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

5.4.1 DC Voltage Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.4.2 A/D Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.4.3 Waveform Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

SECTION 6 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.1 PARTS LIST and Component Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

i

SECTION 1 INTRODUCTION

1.1 GENERAL DESCRIPTION

The OMEGA
large, easy to read, liquid crystal displays (LCD). The input connection for each
instrument consists of a
the available accessory thermistor based probes and sensors. The resistance
value of the thermistor at 25°C (77°F) is 2252 ohms. The instruments are pow­ered by a 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° F range measures temperature from –70°F to 199.9°F with a
resolution of 0.1°F.

The Model 866 measures temperature from –55° to 150°C, on one range, with
a resolution of 0.1°C.

1.2 FEATURES

®

Models 865 and 866 are Hand Held Digital Thermometers with

1

⁄4 inch phone jack, which accommodates any one of

• High Accuracy/Resolution/Repeatability—to 0.1°

• Highly Versatile—Many applications with different probe
configurations (probes not supplied)

• Continuous Automatic Linearization—Dual slope A/D

• Warning Indication—Overrange/Open Sensor/Low Battery

• Long-Life Battery—9 V Alkaline (MN-1604)

• Rugged Construction—Heavy-Duty ABS Plastic Housing

SECTION 2 BEFORE USING

2.1 UNPACKING

Remove the packing list and verify that all the equipment has been received.
If there are any questions about the shipment, please call OMEGA Customer
Service Department at [phone].

Upon receipt of the shipment, inspect the container and equipment for any
signs of damage. Take particular note of any evidence of rough handling in
transit. Immediately report any damage to the shipping agent.

The carrier will not honor any claims unless all shipping
material is saved for their examination. After examining
and removing contents, save packing material and carton
in the event reshipping is necessary.

NOTE

1

2.2 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.

2.3 VERIFICATION CHECK

Install a probe and, at room temperature, hold the tip of the probe between your
thumb and index finger. A reading between 25°C and 40°C should be obtained
for the Model 866, and a reading of 77°F to 104°F should be obtained for the
Model 865, to confirm the functioning of the instrument.

SECTION 3 OPERATION

3.1 SAFETY PRECAUTIONS

A shock hazard exists on the input jack when probes or
sensors are exposed to voltage levels greater than 42 volts,
peak to earth ground. Do not exceed 42 volts, peak to earth
ground

WARNING

Do not attempt to measure temperatures beyond the range
of the probe being used. Probe damage may occur.
Maximum probe temperatures are given in the optional
accessories section. Do not touch the probe tip when
measuring excessively high or low temperatures.

3.2 OPERATING PROCEDURES

3.2.1 Model 865 (See Figure 3-1)

1. Turn power on by selecting the desired 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 Fahrenheit.

CAUTION

NOTE

An open sensor is indicated by a reading on the display of
greater than -100.0°. Overrange is indicated by blanking of
three least-significant digits. Low battery (10% life remaining)
is indicated by LO BAT on the display.

2

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.

An open sensor is indicated by a reading on the display of
greater than -100.0 °. Overrange is indicated by blanking of
the three least-significant digits. Low battery (10% life remain­ing) is indicated by LO BAT on the display.

NOTE

3

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 func­tion. The current that flows through the sensor is inversely proportional to the
resistance of the sensor (Ohm’s Law).

U104B and associated resistors minimize the “on” resistance of the gates of
U101A and B. The input signal must be conditioned by the Log Ratio amplifier,
before being digitized by the A/D converter. The Log Ratio amplifier operates on
two phases: the signal phase and the zero phase.

Each phase has a duration equal to
converter (U102).

Figure 3-2 Model 866 Control Layout

1

⁄2 of the backplane period of the A/D

4

In the signal phase (see Figure 4-1), the source voltage VSis connected to the sen­sor R

. The current that flows through RTalso flows into the collector of Q101. The

T

output voltage of U104C is charged on capacitor C106. Also during this phase, the
input to U104A is grounded and the voltage developed is charged on capacitor
C105.

In the zero phase, the two charged values of voltage are transferred to other parts
of the circuit, as depicted by Figure 4-2. The source voltage V
from the sensor and connected to a zero reference resistor R
flows through R

also flows in the collector of Q101. The output voltage of U104C

Z

is disconnected

S

. The current that

Z

is connected 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.

The voltage charged on C105 is now opposing the output of U104A and therefore
transferred to C110. This is the voltage digitized by the A/D converter (U102). The
fixed reference HI voltage for U102 is provided by current source U105 and its
associated resistors.

Figure 4-1 Signal Phase

5

Figure 4-2 Zero Phase

SECTION 5 SERVICE INFORMATION

5.1 PERFORMANCE ACCURACY CHECK

1. Set up the equipment as shown in Figure 5-1.

2. Follow Table 5-1 to verify instrument performance.

The LO of the resistance box must be connected to the LO (sleeve)
of the

ed to the HI (tip) of the ¹/₄0 phone jack.

¹/₄0 phone jack. The HI of the resistance box must by connect-

NOTE

Figure 5-1 Calibration Setup

6

Table 5-1

PERFORMANCE VERIFICATION

MODEL 865

Step Setting Decade Resistance Allowable Reading

1 200°F 75,750 ohms –39.4 to –40.6
2 200°F 255,700 ohms –68.8 to –71.2
3 200°F 19,220 ohms –00.5 to 00.5
4 200°F 220.8 ohms 188.9 to 191.1
5 300°F 43 ohms 298 to 3021

MODEL 866

Step Setting Decade Resistance Allowable Reading

1 150°C 75,790 ohms –39.6 to –40.4
2 150°C 217,100 ohms –54.2 to –55.8
3 150°C 7,355 ohms –00.3 to 00.3
4 150°C 152.8 ohms 99.4 to 100.6
5 150°C 41.9 ohms 149.2 to 150.7

5.2 DISASSEMBLY

5.2.1 Special Handling Of Static-Sensitive Devices

CMOS devices are designed to function at high impedance levels. Normal
static charge can destroy these devices. U101, U102, and U103 are all
static-sensitive devices, and steps 1 through 7 provide instructions on how
to avoid damaging these devices.

1. Devices should be handled and transported in protective
containers, anti-static tubes, or conductive foam.

2. Use a properly grounded workbench and a grounding wrist strap.

3. Handle device by the body only; do not touch terminals, pins, etc.

4. PC boards must be grounded to bench while inserting devices.

5. Use anti-static solder suckers.

6. Use grounded tip soldering irons.

7. After devices are soldered or inserted into sockets, they are
protected and normal handling can resume.

7

5.2.2 Disassembly Instructions

Turn the instrument off and disconnect the temperature
probe before removing the bottom cover.

When disassembling the instrument, handle the PC
board by the edges. Body oil, dirt, and moisture can
degrade the circuit performance. Keep the PC board
clean and free of contaminants.

1. Place the unit face down on a bench or other similar surface and
remove the screws from the bottom cover.

2. Separate the bottom cover form the rest of the instrument by grasp­ing the top of the case (above the display) and gently lifting it
away from the display.

3. Remove the battery.

WARNING

NOTE

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.
Plastic bezel hooks may fracture.

7. The LCD is held in place on the PC board by a shock resistant­mounting and is assembled as shown in Figure 5-2.

8. To reassemble the unit, reverse the above procedure.

8

Figure 5-2 Models 865 and 866 Exploded View

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.

WARNING

9

5.2.3 Battery Replacement

Turn the instrument off and disconnect the input probe
before removing the bottom cover.

1. Remove the bottom cover of the instrument (see Figure 5-2).

2. Place the battery (MN-1604) in the battery compartment. Observe
proper polarity (see Figure 5-3).

3. Reinstall the bottom cover.

WARNING

5.3 CALIBRATION

Calibration should be performed yearly or whenever the performance verification
procedure indicates that the instrument is out of specification under laboratory
conditions, having an ambient temperature of 23°C63°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.

To prevent a shock hazard, turn the instrument off and
remove the input probe from the instrument before remov­ing the bottom cover.

Figure 5-3 Battery Installation

WARNING

10

1. Set up the equipment as shown in Figure 5-1.

2. Turn on the instrument.

3. Perform calibration. refer to Table 5-2 or Table 5-3, as applicable.

4. Verify correct calibration. Refer to paragraph 5.1, performance
accuracy check.

5. Reinstall the bottom cover.

TABLE 5-2

MODEL 865 CALIBRATION

Step Range Input Adjustment Reading

A 200°F 19220 ohms R111 00.0 6 0 counts
B 200°F 220.8 ohms R110 190.0 6 ¹/₂0 counts
C 300°F 43 ohms R112 300 6 0 counts
D R110 and R112 are interactive. Repeat steps B and C until the results are

repeatable.

Step Range Input Adjustment Reading

A 150°C 7355 ohms R111 00.0 6 0 counts
B 150°C 152.8 ohms R110 100.0 6 ¹/₂0 counts
C 150°C 41.9 ohms R112 150 6 0 counts
D R110 and R112 are interactive. Repeat steps B and C until the results are

repeatable.

5.4 TROUBLESHOOTING

The troubleshooting information, along with appropriate schematics and parts lists, are
included to serve as a guide to enable equipment repair. The schematics and parts
lists may vary slightly from actual production units and are to be used as a guide only.
Likewise, the troubleshooting section is a guide only and cannot cover all possible con­tingencies that may occur.

TABLE 5-3

MODEL 866 CALIBRATION

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
having been tampered with.

11

5.4.1 DC VOLTAGE CHECKS

Using a precision digital voltmeter (DVM), make the following DC voltage checks in
Table 5-4:

Step Item/Component Required Remarks

1 U102 pin 1 referenced >7.2V Battery Voltage

to pin26

2 U102 pin 1 referenced +5V 6 1V 5V Power Supply

to pin 37

3 U102 pin 1 referenced À3V

to pin 30

TABLE 5-4

DC VOLTAGE CHECKS

Condition

5.4.2 A/D MEASUREMENTS

To verify that the A/D and associated circuitry are operating properly, measure the four
voltage points. 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.

All the measurements in steps 2 through 5 are referenced to
analog common.

2. Measure the voltage at U102 pin 31 (IN HI) and record the value.

3. Measure the voltage at U102 pin 30 (IN LO) and record the value.

4. Measure the voltage at U102 pin 35 (REF LO) and record the value.

5. Measure the voltage at U102 pin 36 (REF HI) and record the value.

NOTE

6. Calculate the display reading using the measured voltages and the following formula;

Display Reading (disregarding decimal point) =

(Pin 31 voltage)-(Pin 30 voltage)

1000 x

(Pin 35 voltage)-(Pin 36 voltage)

12

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

1. (Referenced to analog ground)

U102 pin 40 (OSC 1)

2. U102 pin 39 (OSC 2)

3. U102 pin 38 (OSC 3) (Same as step 2.)

4. U102 pin 27 (INTEGRATOR)

(with negative full-scale
input of approximately
1900 counts)

5. U102 pin 21 (Backplane)

13

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° 6 (0.3% rdg + 0.5°F)

– 70.0° to – 40.1° 0.1° 6 (0.3% rdg + 1.0°F)

300°F – 70° to 300° 1° 6 (0.3% rdg + 1°F)

*ACCURACY: Includes repeatability, temperature

coefficient (65° to 82°F), time stability
(1 year), and linearization conformity
errors. Excludes probe errors; how­ever, probe errors around 32°F may
be compensated by an internal
adjustment.

REPEATABILITY: 0.2°F typical for 1 week at constant

ambient temperature.

TEMPERATURE COEFFIECIENT: 65° to 82°F; included in accuracy

specification. From 14° to 65° and
82° to 122°F: less than 6 (0.06% rdg
+0.01°F)/°F.

SENSOR VOLTAGE: 40 mV RMS maximum.

MODEL 866

TEMPERATURE SENSOR TYPE: Thermistor (2252 Ohm @ 25°C)

RANGE TEMPERATURE ACCURACY*

SPAN RESOLUTION 18˚ TO 28˚F; 1 year

150°F – 40.0° to 150.0° 0.1° 6 (0.3% rdg + 0.3°C)

– 55.0° to – 40.1° 0.1° 6 (0.3% rdg + 0.6°C)

14

*ACCURACY: Includes repeatability, temperature

coefficient (18° to 28 °C), time stability
(1 year), and linearization conformity
errors. Excludes probe errors; however,
probe errors around 0°C may be compen­sated by an internal adjustment.

REPEATABILITY: 0.1°C typical for 1 week at constant ambi-

ent temperature.

TEMPERATURE COEFFICIENT: 18° to 28°C; included in accuracy specifica-

tion. From –10° to 18° and 28° to 50° C:
less than 6 (0.06% rdg + 0.01°C)/°C.

SENSOR VOLTAGE: 40 mV RMS maximum.

MODEL 865 AND 866 GENERAL SPECIFICATIONS (unless specified):
DISPLAY: 3

1

⁄2-digit LCD O.5" (13 mm) height. Polarity

and decimal point indication.

CONVERSION RATE: 1.5 readings per second.

OPEN SENSOR INDICATION: Display reads between –100° and –199°.
OVERRANGE INDICATION: 3 least significant digits blanked.
MAXIMUM COMMON

MODE VOLTAGE: 42 V peak to earth.
COMMON MODE REJECTION

(Model 865): Less than 0.01°F/volt at dc, 50 and 60 Hz.

(2kV unbalance, LO driven)

COMMON MODE REJECTION
(Model 866): Less than 0.01°C/volt at dc, 50 and 60 Hz.

(2kV unbalance, LO driven)

ENVIRONMENTAL LIMITS FOR
OPERATING (Model 865): 14° to 122°F, less than 80% relative

ENVIRONMENTAL LIMITS FOR
OPERATING (Model 866): –10° to 50°C, less than 80% relative

humidity up to 95°F; linearly derate 1.5%
R.H./°F from 95° to 122°F.

humidity up to 35°C; linearly derate
3% R.H./°C from 35° to 50°C.

15

ENVIRONMENTAL LIMITS FOR
STORAGE (Model 865): –30° to 140°F, less than 90% relative

humidity up to 95° F; linearly derate 1.5
R.H./°F from 95° to 140°F.

ENVIRONMENTAL LIMITS FOR
STORAGE (Model 866): –35° to 60°C, less than 90% relative

humidity up to 35° C; linearly derate 3%
R.H./°C from 35° to 60°C.

THERMISTOR
LINEARIZATION: Ratiometric dual-slope A/D with continu-

ous linearization.

INPUT CONNECTION:

1

⁄40 (6 mm) phone jack.

POWER: 9 V alkaline or carbon-zinc (NEDA 1604)

battery.

BATTERY LIFE, CONTINUOUS: 350 hours typical with alkaline battery;

200 hours typical with carbon-zinc battery.

BATTERY INDICATOR: Display indicates “LO BAT” when less

than 10% of life remains.

DIMENSIONS, WEIGHT: H: 6.30 (160 mm) x W: 2.70 (69 mm) D:

1.20 (31 mm) Net weight 7.5 oz. (210 gm)

CONSTRUCTION: 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.

16

6.1 PARTS LIST FOR MODELS 865 AND 866

SCHEMATIC SCHEMATIC

DESIG. DESCRIPTION LOCATION

BA101 9V Alkaline Battery, NEDA 1604 F1
C101 Capacitor, 0.047, 50V Metalized Polypropylene E2
C102 Capacitor, 0.1

C103 Capacitor, 0.1
C104 Capacitor, 0.33
C105 Capacitor, 0.33
C106 Capacitor, 0.33

µ

F, 50V Ceramic F1

µ

F, 50V Ceramic G1

µ

F, 63V Metalized Polyester E2

µ

F, 63V Metalized Polyester D3

µ

F, 63V Metalized Polyester D1
C107 Capacitor, 1000p, 1000V Ceramic Disc. C2
C108 Capacitor, 0.1
C109 Capacitor, 0.33
C110 Capacitor, 0.33
C111 Capacitor, 0.33

µ

F, 50V Ceramic F1

µ

F, 63V Metalized Polyester E3

µ

F, 63V Metalized Polyester E3

µ

F, 63V Metalized Polyester E1
C112 Capacitor, 47pF, 500V Silver Mica or Ceramic E2
DS101 3
J1001

1

⁄2" Digit Liquid Crystal Display G4

1

⁄4" Phone Jack A1
J1002 Battery Clip E1
J1003 Battery Clip F1
Q101 NPN Transistor, MPS8099 C2
R101 Resistor, 910 kilohms, 5%,
R102* Resistor, 5.4 kilohms, 0.1%,

1

⁄4W, Composition E2

1

⁄8W, Metal Film D4
R102** Jumper
R103 Factory selected, part of 865-600 B-6
R104* Resistor, 4.6 kilohms, 0.1%,
R104** Resistor, 10 kilohms, 0.1%,
R105* Resistor, 44 kilohms, 0.1%,
R105** Resistor, 21.77 kilohms, 0.1%,
R106* Resistor, 16.5 kilohms, 1%,
R106** Resistor, 6.34 kilohms, 1%,

1

⁄8W, Metal Film D3

1

⁄8W, Metal Film D3

1

⁄8W, Metal Film D3

1

⁄8W, Metal Film D3

1

⁄8W, Metal Film C3

1

⁄8W, Metal Film C3
R107 Thick Film Resistor Network SEV
R108 Factory selected, Part of 31410 E4
R109* Resistor, 3.92 kilohms, 1%,
R109** Resistor, 3.65 kilohms, 1%,

1

⁄8W, Metal Film F5

1

⁄8W, Metal Film F5
R110 Pot, 200 ohms E4
R111* Pot, 5 kilohms C3
R111** Pot, 2 kilohms C3
R112 Pot, 10 ohms D1
R113 Resistor, 392 kilohms, 1%,

1

⁄8W, Metal Film E2

S101 493T, Slide Switch SEV

17

MODEL 865 AND 866 PARTS LIST (continued)

U101 Triple 2 Channel Analog Multiplexer, 4053 SEV

1

U102 3

⁄2 Digit Low Power A/D converter, ICL7136CPL F2
U103 Triple 2 Channel Analog Multiplexer, 4053 SEV
U104 Quad Low Power J-FET, LF44CN SEV
U105 Current Source, LM334 E4
VR101 6.2V, Zener Diode, 1N753 C1

* Model 865

** Model 866

Figure 6-1 Component Layout

18

WARRANTY/DISCLAIMER

USA

MADE

IN

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 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 should malfunction, it must be returned to the factory for evaluation. OMEGA’s Customer Service
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, includ­ing but not limited to mishandling, improper interfacing, operation outside of design limits, improper
repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been
tampered with or shows evidence of being damaged as a result of excessive corrosion; or current, heat,
moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside
of OMEGA’s control. Components which wear are not warranted, including but not limited to
contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any
damages that result from the use of its products in accordance with information provided by
OMEGA, either verbal or written. OMEGA warrants only that the parts
manufactured by it will be as specified and free of defects. OMEGA MAKES NO OTHER
WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED,
EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED.
LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive and the
total liability of OMEGA with respect to this order, whether based on contract, warranty, negli­gence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for consequential,
incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility
as set forth in our basic WARRANTY/ DISCLAIMER language, and additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.

RETURN REQUESTS / INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN
AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT
(IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be
marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to
prevent breakage in transit.

FOR WARRANTY

RETURNS, please have
the following information available BEFORE
contacting OMEGA:

1. P.O. number under which the product was

PURCHASED,

2. Model and serial number of the product

under warranty, and

3. Repair instructions and/or specific

problems relative to the product.

FOR NON-WARRANTY REPAIRS,

consult
OMEGA for current repair charges. Have the
following information available BEFORE
contacting OMEGA:

1. P.O. number to cover the COST

of the repair,

2. Model and serial number of product, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.
This affords our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 1996 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without
prior written consent of OMEGA ENGINEERING, INC.

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

TEMPERATURE

MU

Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies

MU

Wire: Thermocouple, RTD & Thermistor

MU

Calibrators & Ice Point References

MU

Recorders, Controllers & Process Monitors

MU

Infrared Pyrometers

PRESSURE, STRAIN AND FORCE

MU

Transducers & Strain Gauges

MU

Load Cells & Pressure Gauges

MU

Displacement Transducers

MU

Instrumentation & Accessories

FLOW/LEVEL

MU

Rotameters, Gas Mass Flowmeters & Flow Computers

MU

Air Velocity Indicators

MU

Turbine/Paddlewheel Systems

MU

Totalizers & Batch Controllers

pH/CONDUCTIVITY

MU

pH Electrodes, Testers & Accessories

MU

Benchtop/Laboratory Meters

MU

Controllers, Calibrators, Simulators & Pumps

MU

Industrial pH & Conductivity Equipment

DATA ACQUISITION

MU

Data Acquisition & Engineering Software

MU

Communications-Based Acquisition Systems

MU

Plug-in Cards for Apple, IBM & Compatibles

MU

Datalogging Systems

MU

Recorders, Printers & Plotters

HEATERS

MU

Heating Cable

MU

Cartridge & Strip Heaters

MU

Immersion & Band Heaters

MU

Flexible Heaters

MU

Laboratory Heaters

ENVIRONMENTAL
MONITORING AND CONTROL

MU

Metering & Control Instrumentation

MU

Refractometers

MU

Pumps & Tubing

MU

Air, Soil & Water Monitors

MU

Industrial Water & Wastewater Treatment

MU

pH, Conductivity & Dissolved Oxygen Instruments

M0179/0896