Johnson Controls A91 Series Catalog Page

Controls Group 507 E. Michigan Street

P.O. Box 423, Milwaukee, WI 53202

Code No. Lit-1927170

A91 Series

Thermistor Temperature Sensor

A91GAA Duct Sensor with	A91AAA Immersion Sensor
Enclosure

Description	Features
These thermistor sensors are for	•	high sensitivity
use with Johnson Controls Series	•	fast response

R81Q and R93 controllers to

operate Series M100 actuators	• easy to install and wire
and R353 series sequencing
modules.

A91PAA Duct Sensor Less	A91NAA Outdoor Sensor
Enclosure

Applications	To Order
The sensors are designed for a	Specify the code number from the
wide range of applications	following selection chart.
including space, outdoor,
immersion, and duct temperature
sensing.

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	Minimum -40°F (-40°C)
	Temperatures
		Maximum 140°F (60°C)
	Conduit	A91AAA, A91GAA Two 7/8 in. (22 mm) diameter holes for 1/2 in. conduit
	Openings
		A91NAA One 1/2 in. conduit hub
	Element	A91AAA	2 7/16 in. (62 mm)
	Insertion Depth
		A91GAA	7 3/4 in. (197 mm)
	Operating Ranges		40 to 90°F (5 to 30°C), 60 to 120°F (15 to 50°C)
	Wiring Connections		Screw type terminals
		Enclosure	0.062 in. (1.6 mm) cold rolled steel
	Material
		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

Mounting

$äì1$$ Three mounting lugs or conduit connector

$äì3$$ Two holes in bracket

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.

© 02/99 Johnson Controls, Inc

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Controls Group 507 E. Michigan Street

P.O. Box 423, Milwaukee, WI 53202

Code No. Lit-1927170

A91 Series Thermistor Temperature Sensor (Continued)

	3100
	3000
	2900
	2800
	2700
	2600
	2500
	2400
	2 3 0 0
	2 2 0 0
	2 1 0 0
	2000
	1900
<![if ! IE]> <![endif]>Ohms	1 8 0 0
	1 7 0 0
	1 6 0 0
<![if ! IE]> <![endif]>In
<![if ! IE]> <![endif]>Resistance	1 5 0 0					Terminals
	1 4 0 0					"R" to "B"
	1300
	1200
	1100
	1000
	90 0
	80 0
	70 0
	60 0
	50 0
	40 0
	30 0
	20 0	4 0	6 0	8 0		1 0 0	1 2 0	1 4 0	1 60 F
	2 0
	0	0	1 0	2 0	3 0	4 0	5 0	6 0
	1 0								70 C

Temperature

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

	3100
	3000
	2900
	2800
	2700
	2600
	2500
	2400
	23 00
	22 00
	21 00
	2000
	1900
<![if ! IE]> <![endif]>Ohms	18 00
	17 00	Terminals
<![if ! IE]> <![endif]>In	16 00	"R" to "B"
<![if ! IE]> <![endif]>Resistance	15 00
	14 00
	1300
	1200	Terminals
	1100
		"R" to "X"
	1000
	90 0
	80 0
	70 0
	60 0
	50 0
	40 0
	30 0
	20 0

		2 0	4 0	6 0		8 0	1 0 0	1 2 0	1 4 0	1 60 F
	0
		1 0	0	1 0	2 0	3 0	4 0	5 0	6 0	70 C

Temperature

Temperature-Resistance Curve for 40 to 90°F (5 to 30°C) Range and 15 to 50°F (-9 to 10°C) Range

Th er mi s t o r

R

1 4 0

X B

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 Applications Requiring Remote Set point.

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.

© 02/99 Johnson Controls, Inc

2/2