User manual HONEYWELL LF20

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Manual abstract: user guide HONEYWELL LF20

Detailed instructions for use are in the User's Guide.

 [. . . ] T7411A / LF20 / LF20-C / C7068
DUCT TEMPERATURE SENSORS
PRODUCT DATA

FEATURES

· PT100,  PT1000,  or NTC20k temperature sensing element · Wide sensing range · High accuracy · Stainless steel probe

T7411A LF20

C7068

LF20-C

SPECIFICATION
Nominal value PT100 PT1000 NTC20k Accuracy PT100 / PT1000 100  at 0 °C 1000  at 0 °C 20 k at 25 °C IEC751 Class B 0. 3 K +0. 5% · |t| (t in °C) 0. 3 K at 25 °C

GENERAL
The T7411A/LF20/LF20-C/C7068 Duct Temperature Sensors are used in ventilating and air conditioning systems to measure discharge,  return,  or outside air temperature.  [. . . ] 1 on page 2

0. 5 0. 5 0. 5

 42 s  45 s

® U. S. Registered Trademark Copyright © 2007 Honeywell Inc. · All rights reserved

EN0B-0361GE51 R0907

T7411A / LF20 / LF20-C / C7068 DUCT TEMPERATURE SENSORS

Models
OS number LF20 LF20-C T7411A1001 T7411A1019 T7411A1043 C7068A1007 C7068A1007-5m sensor type NTC20k NTC20k PT1000 PT1000 PT100 NTC20k NTC20k sensing range -40. . . +80 °C -40. . . +80 °C -40. . . +80 °C -40. . . +80 °C -40. . . +80 °C 0. . . +70 °C 0. . . +70 °C length in mm (inches) L1 T1 338 (13. 30) 305 (12. 00) 305 (12. 00) -185 (7. 28) 152 (5. 98) 338 (13. 30) 305 (12. 00) 185 (7. 28) 152 (5. 98) cable length: 1. 5 m cable length: 5 m

DIMENSIONS OF T7411A / LF20
47 (1. 85) 23 (0. 91) L1 max. 275 mm (10. 8 in. )

LF20-C
30

6 (0. 23)

6

4 8 55 (2. 17) 50 (1. 97)

19. 5 (0. 75)

T7411A,  LF20
L1 33 (1. 3) 6 (0. 23)

19. 5 (0. 75)

65 (2. 55)

T1 7 (0. 28) case hole diameter allows Pg9 cable

Fig. Dimensions of T7411A / LF20 and LF20-C in mm (inches)

EN0B-0361GE51 R0907

2

T7411A / LF20 / LF20-C / C7068 DUCT TEMPERATURE SENSORS

INSTALLATION
wiring run sensor to controller max. length 200 m (660 ft)

INSTALLATION OF C7068

The temperature offset due to wire resistance per 10 m distance from sensor to controller,  when using the T7411A (PT100 / PT1000) is stated in the following table:

type of wire PT1000 2 0. 5 mm (AWG20) 0. 18 °C (0. 324 °F)
1. 0 mm (AWG17) 0. 09 °C (0. 162 °F) 1. 5 mm (AWG15) 0. 06 °C (0. 108 °F)
2 2

PT100 1. 8 °C (3. 24 °F)
0. 9 °C (1. 62 °F) 0. 6 °C (1. 08 °F)

NOTE: Use shielded wiring in areas with high EMI.  [. . . ] Installation of the C7068 in mm (inches)

3

EN0B-0361GE51 R0907

Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl,  Ecublens,  Route du Bois 37,  Switzerland by its Authorized Representative:

Automation and Control Solutions Honeywell GmbH Böblinger Strae 17 D-71101 Schönaich Phone: (49) 7031 63701 Fax: (49) 7031 637493 http://ecc. emea. honeywell. com Subject to change without notice.  [. . . ]

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