Chromalox 2110 Kullanım Kılavuzu - Sayfa 8

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Sensor Input Wiring

For safety and best controller performance,

• Sensor leads (thermocouple and RTD) should not

be run in the same conduit as power wiring.

• Twisted pair, shielded wire is recommended for sen-

sor connections.

• False temperature readings can occur if the sensor

wire is exposed to electrical noise.

• Ungrounded thermocouples are recommended.

• Thermocouple extension wire, if required, must be

the same type as the thermocouple (i.e. if a Type K

thermocouple is used, then Type K extension wire

must be used.)

• Shielded thermocouple wire, if used, must have the

shield grounded at one end only, preferably at the

shield ground terminal on the controller as shown in

Figure 3.6.

• Three-wire RTDs are recommended for greatest ac-

curacy.

• Standard shielded copper wire is recommended for

RTD extensions.

Thermocouple Inputs

It is important to observe polarity (+,-) when connect-

ing thermocouple leadwires. ANSI color coding for the

thermocouples used with this instrument are

Thermocouple

Material

Type

iron/constantan

chromel/alumel

Make thermocouple wiring connections to terminals as

shown in Figure 3.6.

TC +

TC -

Figure 3.6

Thermocouple Connections with Shield

Three-Wire RTD Inputs

IMPORTANT: When making the three-wire RTD

input connection, make the resistance of all

three extension leadwires equal by using the

same gauge and same length of wire for opti-

mum accuracy.

A three-wire RTD will generally have two wires of the

same color. Connect the same colored wires to the

RTDL connections. Connect the alternate colored wire

to the RTDH connection.

Make three-wire RTD connections to terminals as

shown in Figure 3.7.

Polarity

(+)

(-)

white

red

Two-Wire RTD Inputs

yellow

red

If using a two-wire RTD input, use heavier gauge lead-

wires to reduce leadwire resistance. Any leadwire re-

sistance adds directly to sensor resistance, thus add-

ing error to the process temperature measurement. It

is also necessary to jumper the two RTDL terminals on

the instrument to complete a two-wire hookup.

COM

Shield

Ground

RTDH

RTDL

Figure 3.7

Three-Wire RTD Connections with Shield

RTDH

RTDL

Figure 3.8

Two-Wire RTD Connections

COM

Shield

Ground

COM