Johnson Controls A91 Series Catalog Page

Controls Group 507 E. Michigan Street

P.O. Box 423, Milwaukee, WI 53202

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A91 Series

Thermistor Temperature Sensor

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Code No. Lit-1927170

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A91GAA Duct Sensor with

Enclosure

Description

These thermistor sensors are for use with Johnson Controls Series R81Q and R93 controllers to operate Series M100 actuators and R353 series sequencing

A91AAA Immersion Sensor

Features

• high sensitivity

• fast response

• easy to install and wire

A91PAA Duct Sensor Less

Enclosure

Applications

The sensors are designed for a wide range of applications including space, outdoor, immersion, and duct temperature sensing.

modules.

Selection Chart

Code Number Temperature Range °F (°C) Description

A91AAA-10C 40 to 90°F (4 to 32) Immersion sensor A91AAA-11C 60 to 120°F (15 to 50) Immersion sensor A91GAA-1C 60 to 120°F (15 to 50) Duct sensor with enclosure A91GAA-2C 40 to 90°F (4 to 32) Duct sensor with enclosure A91NAA-3C 40 to 90°F (4 to 32) Outdoor sensor with enclosure A91PAA-1C 60 to 120°F (15 to 50) Duct sensor less enclosure A91PAA-2C 40 to 90°F (4 to 32) Duct sensor less enclosure

Specifications

A91 Series Thermistor Temperature Sensors

Ambient Temperatures

Conduit Openings

Element Insertion Depth

Operating Ranges 40 to 90°F (5 to 30°C), 60 to 120°F (15 to 50°C) Wiring Connections Screw type terminals

Material

Mounting

Minimum -40°F (-40°C)

Maximum 140°F (60°C)

A91AAA, A91GAA Two 7/8 in. (22 mm) diameter holes for 1/2 in. conduit

A91NAA One 1/2 in. conduit hub A91AAA 2 7/16 in. (62 mm) A91GAA 7 3/4 in. (197 mm)

Enclosure 0.062 in. (1.6 mm) cold rolled steel

Tube A91AAA–thin copper with soft solder A91GAA–thin aluminum

Connector A91AAA – 2 1/4 in. (57 mm) extention,1 1/16 in. (27 mm) hex brass with 3/4 in. NPT threads

$äì$$$ 3/4 in. NPT connector $äì*$$ Two holes in back of case $äì1$$ Three mounting lugs or conduit connector $äì3$$ Two holes in bracket

A91NAA Outdoor Sensor

To Order

Specify the code number from the following selection chart.

The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products.

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Controls Group 507 E. Michigan Street

3100 3000 2900 2800 2700 2600 2500 2400

2300 2200 2100

2000 1900

1800 1700 1600

1500 1400

1300 1200 1100 1000

900 800 700 600

500 400 300 200

10 0 1020304050 60

20 40 60 80 100 120 140 160 F

70 C

Temperatur e

Resistance In Ohms

Terminals "R" to "B"

Terminals "R" to "X"

P.O. Box 423, Milwaukee, WI 53202 Code No. Lit-1927170

A91 Series Thermistor Temperature Sensor (Continued)

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3100 3000 2900 2800 2700 2600 2500 2400

2300 2200 2100

2000 1900

1800 1700 1600

1500 1400

1300

Resistance In Ohms

1200 1100 1000

900 800 700 600

500 400 300

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200

20 40 60 80 100 120 140 160 F

10 0 1020304050 60

Temperatur e

Temperature-Resistance Curve for 60 to 120°F (15 to 50°C)

Range

Terminals “R” and “B” Are Used For 40 to 90°F Range With Integral Set point at Controller.

Terminals “R” and “X” Are Used on Applic a ti ons Requiring Remote Set point.

Termina ls "R" to "B"

70 C

Therm i st o r

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Temperature-Resistance Curve for 40 to 90°F (5 to 30°C) Range

and 15 to 50°F (-9 to 10°C) Range

140

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