Honeywell C7068, LF20, T7411A, LF20-C User Manual

T7411A / LF20 / LF20-C / C7068

T7411A

LF20

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. They are designed for duct mounting. The
T7411A is available with two different probe lengths.

These sensors are used in the following control systems:

• Excel 5000

• MicroniK 200

• MicroniK 100

• Excel Classic

• Excel Plus

• High Performance Excel Plus

• Excel EMC

or other systems using PT100, PT1000, or NTC 20kΩ
temperature sensing elements.

Further, the C7068 is also suitable for installation in fancoil
units or at air outlets.

C7068

LF20-C

DUCT TEMPERATURE SENSORS

PRODUCT DATA

FEATURES

• PT100, PT1000, or NTC20kΩ temperature sensing
element

• Wide sensing range

• High accuracy

• Stainless steel probe

SPECIFICATION

Nominal value

PT100 100 Ω at 0 °C
PT1000 1000 Ω at 0 °C
NTC20kΩ 20 kΩ at 25 °C

Accuracy

PT100 / PT1000 IEC751 Class B

0.3 K +0.5% • |t| (t in °C)

NTC20kΩ 0.3 K at 25 °C

Sensitivity

PT100 ≈ 0.385 Ω / K
PT1000 ≈ 3.85 Ω / K
NTC20kΩ ≈ -934.5 Ω / K at 25 °C
(non-linear)

Response time (at air velocity of 5 m/s [16.4 ft/s])

τ

LF20, LF20-C

T7411

C7068

Electrical connection

T7411A/LF20 terminals for 2 x 1.5 mm² cable
LF20-C 5 m cable, 2-core,
seawater-resistant,
conduit M16x1,5
C7068 1.5-m cable, 2-core
C7068-5m 5-m cable, 2-core

Ambient Limits

Storage temperature -35...+70 °C (-31…+158 °F)
Humidity (T7411, LF20) 5…95% rh, non-condensing

Safety (terminal box)

Protection standard

T7411A IP54
LF20 IP30
LF20-C IP65

C7068 IP54
Flame retardant V1 as per UL94
Plastic (PC)
Dimensions See Fig. 1 on page 2

≈ 42 s

0.5

τ

≈ 45 s

0.5

τ

≈ 4 min (at 1 m/s [3.3 ft/s])

0.5

® U.S. Registered Trademark EN0B-0361GE51 R0907
Copyright © 2007 Honeywell Inc. • All rights reserved

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

Models

OS number sensor type sensing range

LF20
LF20-C
T7411A1001 PT1000 -40...+80 °C 185 (7.28) 152 (5.98)
T7411A1019 PT1000 -40...+80 °C 338 (13.30) 305 (12.00)
T7411A1043 PT100 -40...+80 °C 185 (7.28) 152 (5.98)
C7068A1007
C7068A1007-5m

NTC20kΩ
NTC20kΩ

NTC20kΩ
NTC20kΩ

-40...+80 °C 338 (13.30) 305 (12.00)

-40...+80 °C 305 (12.00) --

0...+70 °C cable length: 1.5 m

0...+70 °C cable length: 5 m

length in mm (inches)

L1 T1

DIMENSIONS OF T7411A / LF20

47 (1.85)

23 (0.91)

max. 275 mm

(10.8 in.)

L1

LF20-C

0

3

6

6 (0.23)

4

8

55 (2.17)

19.5

(0.75)

T7411A, LF20

50 (1.97)

6 (0.23)

T1

7 (0.28)

Fig. 1. Dimensions of T7411A / LF20 and LF20-C in mm (inches)

case hole diameter

allows Pg9 cable

L1

19.5

(0.75)

33 (1.3)

65

(2.55)

EN0B-0361GE51 R0907

2