SNAP Analog Input Modules

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RTD Input Modules

Wiring

RTD input modules are designed for three-wire connections,

shown in the diagram below.

If you use a four-

wire connection

(shown at the

bottom right),

DO NOT connect

the fourth wire,

as it will cause

errors in the

readings.

Two-wire

connections

are not

recommended,

as they will

degrade

accuracy and

stability.

Part Number

Description

SNAP-AIRTD-1K

Two-channel 1000 ohm platinum RTD input

SNAP-AIRTD

Two-channel 100 ohm platinum RTD input

SNAP-AIRTD-10

Two-channel 10 ohm copper RTD input

SNAP-AIRTD, SNAP-AIRTD-1K, and SNAP-AIRTD-10

IMPORTANT: The mounting rack connector has 24 pins; the

module connector has 20 pins. The extra pins on the

mounting rack connector prevent misalignment of the

module during installation.

Description

The SNAP-AIRTD and SNAP-AIRTD-1K platinum and the

SNAP-AIRTD-10 copper modules are usually used for

temperature inputs. They can also be used to make high-

resolution resistance measurements.

On all three modules, the two inputs share the same

reference terminal. Make sure you use isolated RTD probes.

The SNAP-AIRTD-10 and SNAP-AIRTD-1K require a SNAP

PAC brain or R-series controller.