Honeywell STB-TW, STB DATASHEET
3
0
Mechanical Thermostats
Temperature monitors and limiters
TB
S
STB series temperature monitors
and limiters
Tested according to DIN 3440
STB+TW
Technical data
Body Diecast aluminium with
Immersion tube Brass G 1/2”,
Max. ambient +80°C at the switching
temperature head
Switching point (in upper third of scale)
accuracy for TW, STW, STB:
Switching (in % of scale range)
differential for TR, TW: 3–4 %
Lead seal The cover of the switching
Switching 10 (2)
capacity
Degree of
protection
plastic cover.
i
ncluded with product
Stainless steel G 1/2”,
order separately.
Type T4NSTF or T5NSTF,
see Product Summary
± 5 %
± 1.5 %
TR:
for
(in % of scale range)
for STW, STB: 4–6%
device can be lead sealed
t the internal settings
so tha
of the limiter switching
points are no longer accessible after sealing.
AC
V
250
A,
IP 54
The temperature monitors and temperature limiters meet the requirements of DIN 3440 and can
thus be used for heating systems according to
D
IN 4751, steam and hot water systems and
function (STW, STB) are self-monitoring, i.e. in
the event of breakage or leaks in the measuring
system the circuit is opened and the system is
s
witched off to the safe side.
district heating systems. The devices with safety
Connection schemes:
In devices with a dual function there are 2 switching elements. Pay attention to the function of the relevant switch when connecting.
TW, STW, TR
Type
Function
Setting range
TÜV test
tificate
cer
Setting
Controls
accessible
from outside
Contact
Reclosing
lockout
(internal)
Max. temperature at sensor
Immersion
depth
Permitted
pressure,
brass immersion tube
Permitted pressure, stainless
steel immersion tube
STW 1F
Safety temperature monitor
20 to 150° C
STW (STB)
89401S
internal
none
Changeover
no
175°C
150 mm
40 bar
80 bar
T4NSTF
STW + TRF
Safety temperature monitor
and controller
20 to 150° C
TR/STW (STB)
89901S
STW internal
TR external
Setting wheel
for TR
2 x changeover
no
175°C
150 mm
25 bar
40 bar
T5NSTF
STB
STB + TWF
Safety temperature limiter
and monitor
30 to 110° C
TW / STB
90401
STB internal
TW internal
Reclosing button
NC (STB) and
changeover
(TW)
yes
130°C
150 mm
25 bar
40 bar
T5NSTF
STB + TRF
Safety temperature limiter
and controller
30 to 110° C
TR / STB
90001
STB internal
TR external
Reclosing button and setting wheel for
TR
NC (STB) and
changeover
(TR)
yes
130°C
150 mm
25 bar
40 bar
T5NSTF
STB 1F
Safety temperature limiter
60 to 130° C
STB
89501
internal
Reclosing button
NC
yes
150°C
150 mm
40 bar
80 bar
T4NSTF
TWP 1F
Temperature
monitor
20 to 150°C
TW
89201
internal
none
Changeover
no
175°C
100 mm
40 bar
80 bar
T4NSTF
s
tested
Degree of protection:
IP 54
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