Honeywell STF21-75, STF21-220, STF31-75, STF31-220 PRODUCT DATA AND MOUNTING INSTRUCTIONS
STF
Fast Temperature Sensors for Industrial and HVAC Applications
PRODUCT DATA AND MOUNTING INSTRUCTIONS
SPECIFICATIONS
Nominal value
STF21 (PT100) 100 Ω at 0 °C
STF31 (PT1000) 1000 Ω at 0 °C
Accuracy
STF21/31 IEC751 Class A
±(0.15 K +0.2% • |t|) (t in °C)
Sensitivity
FEATURES
• Cost-effective high-accuracy solution.
• Materials in contact with medium are made of stainless
steel.
• Immersion length adjustable.
• Easy installation.
• Universal solution for industry and HVAC.
GENERAL
The temperature sensors of series STF are designed for
universal use in systems of machine construction, process
control, HVAC, environmental and agricultural area. Costeffective and high-accuracy sensor technology allows usage
in a wide field of applications where PT100 and PT1000
sensor technology is a standard. The STF 21 / 31 immersion
Temperature Sensor can also be used in heating, cooling, or
domestic hot water applications where fast-response temperature measurement is required. Material in contact with
medium: stainless steel 1.4571.
STF21 (PT100) ≈ 0.385 Ω / K
STF31 (PT1000) ≈ 3.85 Ω / K
τ
Response time
Well
Pressure rating PN16 (nominal)
Wiring 3-wire type
Maximum medium velocity
75 mm length 20 m/s
220 mm length 10 m/s
Medium Mineral and synthetic oil,
Material
Screw connection Stainless steel 1.4571 (AISI 316 Ti)
Sensor well Stainless steel 1.4571 (AISI 316 Ti)
Dimensions ∅ 4 mm, length ~ 75 and 220 mm
Outlet size R1/2"
Cable length 2.5 m
Protection class IP 65
= 2.5 seconds
0.5
glycol-water mixtures, domestic hot
water, air, and media compatible
with stainless steel 1.4571
® U.S. Registered Trademark EN0B-0474GE51 R1105
Copyright © 2005 Honeywell Inc.
All Rights Reserved
STF Fast Temperature Sensors
MODELS
OS no. sensor type / length sensor temp. range
STF21-75 PT100 / 75 mm
STF21-220 PT100 / 220 mm
STF31-75 PT1000 / 75 mm
STF31-220 PT1000 / 220 mm
-20...+260 °C
(-4...+500 °F)
ELECTRICAL CONNECTION
Wire the temperature sensor in accordance with Fig. 1. The
terminals are insensitive to polarity. STF sensors are 3-wire
types; thus, if the controller is suitably equipped, the influence
of cable lengths can be compensated for. However, if the
controller does not support 3-wire connection, the sensors
can also be used in a 2-wire manner (connect 1-3). In order to
minimize the influence of EMC, keep wiring to the controller
as short as possible.
3
1
Fig. 1. 1 x 3-wire circuit
2
COMPATIBILITY
STF31 sensors can be used together with SmartTemp
evaluation module TST...EPT1K.
STF21 and STF31 sensors can be used together with the
APT600 and APT650 programmable temperature displays.
MOUNTING
1. Using a hexagonal wrench, screw the R1/2" screwing
connection into the process line or the immersion well until
snug. Use appropriate sealing material (e.g. hemp or
Teflon tape.
2. With the nut still loose, slide the sensor to the desired
depth.
3. Tighten the nut as tightly as possible by hand.
4. Now use an open-end wrench to rotate the nut another
min. ¼ of a rotation / max. ½ of a rotation.
2
1
Fig. 2. Mounting steps 1-4
NOTE: Tightening the nut the minimum of ¼ of a rotation
does not permanently deform the immersion well,
thus permitting its depth to be subsequently readjusted, if desired. Tightening the nut the maximum
of ½ of a rotation permanently deforms the
immersion well, thus making subsequent readjustment of the depth impossible.
3 4
DIMENSIONS
75 220/
16
SW22
SW10
R 1/2”
40
Fig. 3. STF21/31 dimensions (in mm)
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:
Fema Controls
Honeywell GmbH
P.O. Box 1254
D-71099 Schönaich
Phone: (49) 7031-637-02
Fax: (49) 7031-637-850
http:/honeywell.de/fema
Subject to change without notice. Printed in Germany
EN0B-0474GE51 R1105
25/170
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