Tekmar 521 Programmable Thermostat Installation Manual de usuario descargar pdf (Pagina 8)

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A Watts Water Technologies Company

Slab Sensor 079 Testing

A good quality test meter capable of measuring up to 5,000 k (1 k = 1000) 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 room temperature using the thermometer. Disconnect the S1 or S2

and Com wires from the thermostat. Using an electrical meter, measure the resistance

of the S1 or S2 and Com wires at the thermostat location. Using the temperature

versus resistance table, estimate the temperature measured by the sensor. The sensor

measurement 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. Once the test has been completed,

reconnect the S1 or S2 and Com wires to the thermostat.

Do not apply voltage to the temperature sensor terminals at any time as damage to

the sensor may result.

Temperature vs. Resistance Table

Temperature Resistance

°F °C

-50 -46 490,813

-45 -43 405,710

-40 -40 336,606

-35 -37 280,279

-30 -34 234,196

-25 -32 196,358

-20 -29 165,180

-15 -26 139,402

-10 -23 118,018

-5 -21 100,221

0 -18 85,362

5-15 72,918

10 -12 62,465

15 -9 53,658

20 -7 46,218

Temperature Resistance

°F °C

25 -4 39,913

30 -1 34,558

35 2 29,996

40 4 26,099

45 7 22,763

50 10 19,900

55 13 17,436

60 16 15,311

65 18 13,474

70 21 11,883

75 24 10,501

80 27 9,299

85 29 8,250

90 32 7,334

95 35 6,532

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 27 28

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