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) |
FEATURES
Sensitivity |
|
STF21 (PT100) |
≈ 0.385 Ω / K |
STF31 (PT1000) |
≈ 3.85 Ω / K |
Response time |
τ0.5 = 2.5 seconds |
Well |
|
Pressure rating |
PN16 (nominal) |
Wiring |
3-wire type |
Maximum medium velocity
•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.
75 mm length |
20 m/s |
220 mm length |
10 m/s |
Medium |
Mineral and synthetic oil, |
|
glycol-water mixtures, domestic hot |
|
water, air, and media compatible |
|
with stainless steel 1.4571 |
Material |
|
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.
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 |
® 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 |
-20...+260 °C |
STF31-75 |
PT1000 / 75 mm |
(-4...+500 °F) |
STF31-220 |
PT1000 / 220 mm |
|
|
|
|
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.
|
|
|
|
|
|
|
|
|
|
|
|
||
1 |
2 |
|
3 |
|||
|
Fig. 1. 1 x 3-wire circuit |
|
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 |
3 |
4 |
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.
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.
DIMENSIONS |
|
75 / 220 |
|
16 |
|
SW22 |
|
SW10 |
R 1/2” |
40 |
25/170 |
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