Honeywell L91B Manuel D’Utilisation

60-2152—08

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When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the 

TRADELINE® Catalog or price sheets for complete ordering number.

If you have additional questions, need further information, or would like to comment on our products or services, please write or 

phone:

1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).

2. Honeywell Customer Care

1885 Douglas Drive North

Minneapolis, Minnesota 55422-4386

In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, Ontario M1V 4Z9.

International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, 

Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

L91A: Single potentiometer; nonadjustable proportioning 

range.

L91B: Single potentiometer; adjustable proportioning range.

L91D: Two potentiometers allow unison control of motors; 

adjustable proportioning range.

Electrical Rating: 24 Vac.

Potentiometer Action: Wiper moves toward W on pressure 

rise, toward B on pressure fall. Potentiometer is field 

replaceable.

Potentiometer Resistance: 140 ohms (nominal) for L91A, B, 

and D models.

Pressure Sensing Element: Brass bellows, 10-300 psi 

models phos-bronze bellows.

Minimum Ambient Temperature: 32° F (0° C)

Maximum Ambient Temperature: 150° F (66° C)

Adjustment Means: Screws on controller case top; knurled 

knob for main scale setting on 10 to 300 psi (0.07 to 2.07 

MPa) models.

Setpoint: At low pressure end of proportioning (throttling) 

range.

Main Scaleplate: Marked in both U.S. customary (oz/sq. in, 

psi, or in. Hg) and metric (kPa, MPa, or mm Hg) units.

Proportioning Range Scaleplate (L91B,D only): Gradu-

ated from A to F with a MIN (minimum) value below A. 

(See Table 2 for the value of each division.)

Mounting Means: Fitting on bellows has 1/4 - 18 NPT 

threads (external on 0 to 16 oz/sq. in., 0 to 4 psi, and 0 to 

15 psi models; internal on all other models) for mounting on 

a pipe or steam trap (siphon loop).

NOTE: Some models are available with 1/4 - 19 BSP-TR 

internal threads; see Table 1.

Also can be surface mounted by screws through two knockout 

holes in case back.

L91A 0 to 15 psi

0 to 103 kPa

23176CB

No

0.5 psi

3.4 kPa 25

172

5 to 150 psi

0.03 to 1.03 MPa 23176CB

No

5 psi

0.03 MPa

225

1551

10 to 300 psi

b

0.07 to 2.07 MPa 23176CB

No

12 psi

0.08 MPa

350

2413

L91B 0 to 15 psi

0 to 103 kPa

23176CF

Yes

1.5 to 12 psi

10 to 83 kPa

25

172

5 to 150 psi

c

0.03 to 1.03 MPa 23176CB

Yes

5 to 23 psi

35 to 160 kPa

225

1551

10 to 300 psi

c

0.07 to 2.07 MPa 23176CB

Yes

12 to 48 psi

85 to 330 kPa

350

2413

10 to 300 psi

0.07 to 2.07 MPa 23176CF

Yes

30 to 110 psi

0.21 to 0.76 MPa 350

2413

L91D 0 to 15 psi

0 to 103 kPa

23176CF

Yes

1.5 to 12 psi

10 to 83 kPa

25

172

5 to 150 psi

c

0.03 to 1.03 MPa 23176CF

Yes

13 to 52 psi

0.09 to 0.36 MPa 225

1551

10 to 300 psi

c

0.07 to 2.07 MPa 23176CF

Yes

30 to 110 psi

0.21 to 0.76 MPa 350

2413