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
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