tekmar 071 User Manual

- Data Brochure

D 071

Universal Sensor 071

The tekmar Universal Sensors have a brass sleeve for fast response and a wide operating
range. These sensors can be used in a multitude of applications. The 071 is supplied with
12 inches (300 mm) of two conductor wire.

Installation - Universal Sensor 071

STEP ONE

NOTE: These sensors are designed to mount on a pipe or in a temperature immersion well.

The Universal Sensor can be strapped directly to the
pipe using the cable tie provided. Insulation should
be placed around the sensor to reduce the effect of
air currents on the sensor measurement.

MOUNTING THE SENSOR

03/09

The Universal Sensor should be placed downstream
of a pump or after an elbow or similar fitting. This is
especially important if large diameter pipes are used
as the thermal stratification within the pipe can result
in erroneous sensor readings. Proper sensor location
requires that the fluid is thoroughly mixed within the
pipe before it reaches the sensor.

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STEP TWO

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Caution: Do not run sensor wires parallel to telephone or power cables. If the sensor
wires are located in an area with strong sources of electromagnetic interference, shielded
cable or twisted pair should be used or the wires can be run in a grounded metal conduit.
If using shielded cable, the shield wire should be connected to the Com Sen terminal on
the control and not to earth ground.

• If a Universal Sensor Enclosure 080 is used to mount the 071, follow the installation

• Without the Universal Sensor Enclosure 080, it is necessary to connect 18 AWG wire to

• Follow the sensor testing instructions given in this brochure and then connect the wires

instructions provided the Data Brochure D 080.

the two sensor wires. Wire nuts can be used to hold the wires together.

to the control.

WIRING AND TESTING THE SENSOR

Sensor Testing Instructions

A good quality test meter capable of measuring up to 5,000 kΩ (1 kΩ = 1000Ω) is required to
measure the sensor resistance. In addition to this, the actual temperature must be measured
with either a good quality digital thermometer, or if a thermometer is not available, a second
sensor can be placed alongside the one to be tested and the readings compared.

First measure the temperature using the thermometer and then measure the resistance of
the sensor at the control. The wires from the sensor must not be connected to the control
while the test is performed. Using the chart on the following page, estimate the temperature
measured by the sensor. The sensor and thermometer readings should be close. If the test
meter reads a very high resistance, there may be a broken wire, a poor wiring connection
or a defective sensor. If the resistance is very low, the wiring may be shorted, there may be
moisture in the sensor or the sensor may be defective. To test for a defective sensor, measure
the resistance directly at the sensor location.

Do not apply voltage to a sensor at any time as damage to the sensor may result.

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