Honeywell STT250 is a versatile temperature transmitter designed for various industrial applications. It offers a wide range of housing options to accommodate different mounting requirements, including direct sensor head, pipe, or wall mounting. The transmitter can be used in general-purpose, intrinsically safe, or explosion-proof environments, making it suitable for hazardous locations. It also features local or remote indication options with analog or smart meters for precise temperature monitoring and display.
Honeywell STT250 is a versatile temperature transmitter designed for various industrial applications. It offers a wide range of housing options to accommodate different mounting requirements, including direct sensor head, pipe, or wall mounting. The transmitter can be used in general-purpose, intrinsically safe, or explosion-proof environments, making it suitable for hazardous locations. It also features local or remote indication options with analog or smart meters for precise temperature monitoring and display.
Honeywell
Housings for STT 3000
Series STT250
SMART TEMPERATURE TRANSMITTER
EN0I-6032 01/98 Housing Specifications and Dimensional Drawings
OVERVIEW
Honeywell’s STT250 range of
Temperature Transmitters
can
be supplied with
a wide variety
of enclosures for direct sensor
head, 2” pipe or wall mounting.
Available materials include
Aluminium, Plastic, Cast Iron
and 316 Stainless Steel.
Select the most suitable
housing for lowest installed
cost, lightweight, corrosive
environments or for safety
approvals - whichever is most
important to match your
requirements.
• All the housings for direct
sensor head mounting include
the facilities for spring loading
of the STT250 transmitter
module at a 33mm pitch (DIN
43729).
• When integral meter is
required, choose the pipe or
wall (field) mount housing.
For Flame-Proof EEx d
applications, choose the Cast
Iron housing and ensure that
the sensor connection is
sealed with an approved
flametrap by ordering the
sensor assembly with the
transmitter and housing.
• For FM or CSA Explosion-Proof
applications, choose the
Aluminium or 316 SS field
mount housing.
• The housings can be supplied
with the STT250 transmitter
installed by specifying from the
STT250 Model Selection Guide
included in Sales Specification
Sheet EN0I-6031.
• If the temperature transmitter is
pipe or wall mounted, a housing
can be supplied with a sensor
and a terminal block installed
for connection to the remote
mounted transmitter.
• Order sensor and thermowells
for this direct sensor head
mounting by referring to
Specification EN0I-6033 (non-
North America) and 34-44-29-
01 (North America).
EN0I-60322
Housing Specifications (in mm)
Aluminium Direct Head Mount
Housing
Suitable for general purpose or
Intrinsically Safe applications.
Dimensions shown in Fig. 1.
Housing entry length = 41 mm
Material : LM24 Aluminium die casting.
Sensor entry : 1/2”NPT
Cable / conduit entry : 1/2”NPT or
M20x1.5.
Weight : 0.3kg (0.7 lb)
Paint cover : beige polyester/ epoxy
hybrid.
Enclosure classification : IP65
Order as STT250 Table II selection A _ _.
33
2 x M4
40
2 x M3
41
1/2" NPT
or M20
1/2" NPT
B-B section A-A section
Figure 1
Plastic Direct Head Mount
Housing
Suitable for lightweight installation in salt
air environments and for general purpose
or Intrinsically Safe installations.
Maximum temperature = 70° C (158° F)
Dimensions shown in Fig. 2.
Housing entry length = 26,5 mm
Material : ABS
Sensor entry : 1/2”BSP (equivalent to
1/2”NPT)
Cable/ conduit entry : M20x1.5
Colour : light beige
Weight : 0.1kg (0.2 lb)
Enclosure classification : IP67
Order as STT250 Table II selection P _ _.
A
2 x M4
33
A
85
1/2" NPT
1/2" NPT
or M20
26.5
57
C-C section A-A section
Figure 2
Cast Iron Direct Head Mount
Housing
Suitable for Flame-Proof EEx d
applications when sensor with flame trap
is included in total assembly.
Dimensions shown in Fig. 3.
Housing entry length = 41 mm
Material : Cast Iron
Sensor entry : 1/2”NPT
Cable/ conduit entry : M20x1.5
paint cover : light beige
Weight : 2.5kg (5.5 lb)
Enclosure classification : IP68
Conforms to the applicable requirements
of NEMA 7 and 9.
Order as STT250 Table II selection B _ _.
2 x M4
2 x M4
111
41
33
( 104)
1/2" NPT
1/2" NPT
or M20
B-B section A-A section
Figure 3
EN0I-6032 3
316 Stainless Steel Direct Head
Mount Housing
Suitable for corrosive/ salt spray
environments and for general purpose or
Intrinsically Safe applications.
Dimensions shown in Fig. 4.
Housing entry length = 40 mm
Material : 316SS
Sensor entry : 1/2”NPT
Cable/ conduit entry : 1/2”NPT or
M20x1.5
Paint cover : none.
Weight : 1.6kg (3.5 lb)
Enclosure classification IP65
Order as STT250 Table II selection S _ _.
Flame-Proof version available.
80
40
2 x M4
33
100
1/2" NPT
or M20
1/2" NPT
B-B section A-A section
Figure 4
Meters
Honeywell’s Series STT250 Temperature Transmitters can be supplied with local or remote indication. An Analogue or
Smart meter can be mounted integral to the transmitter inside the field mount housing. Order an integral meter as part
of the model number; Table II _ _ M and _ _ S, respectively. Order a remote meter as model RMA300.
The analogue meter is a 4-20mA moving coil type and displays the temperature in 0 to 100% span.
The Smart meter accepts 4-20mA or DE protocol and displays temperature on a LCD in engineering units or 0 to
100% span. The Smart meter displays temperature in 0 to 100% span with the STT25H HART unit. Refer to 34-ST-
25-08D for more details.
The remote digital meter reads DE protocol and displays temperature on a LCD in 0 to 100% span. Refer to 34-ST-25-
07A for details.
STT250 Dimensions
Aluminium Pipe or Wall (Field) Mount Housing
Suitable for pipe or wall mounting remote from the temperature sensor, for direct sensor head mounting (in North
America), for local indication and for Explosion-Proof (FM/ CSA and Cenelec), Intrinsically Safe or general purpose
applications.
Dimensions shown in Fig. 5 and 6.
Material : Low copper Aluminium alloy
Cable/ Conduit entries : 1/2”NPT.
Paint cover : Beige polyester/ epoxy hybrid or beige epoxy painted.
Weight : 1.1kg (2.4 lb)
Enclosure classification : IP65. Conforms to the applicable requirements of NEMA 7and 9 for FM/ CSA Explosion-Proof
applications.
Order as STT250 Table II selection E _ _ or X _ _, respectively.
316 Stainless Steel Pipe or Wall (Field) Mount Housing
Suitable for corrosive/ salt spray environments and for pipe or wall mounting remote from the temperature sensor, for
direct sensor head mounting (in North America), for local indication and for Explosion-Proof (FM/ CSA and Cenelec),
Intrinsically Safe or general purpose applications.
Dimensions shown in Fig. 5 and 6.
Material : 316SS
Cable/ Conduit entries : 1/2”NPT. 3/4” NPT or M20 available via an adaptor.
Paint cover : none.
Weight : 3.2 kg (6.9 lb)
Enclosure classification : IP65
Order as STT250 Table II selection T _ _.
EN0I-60324
Dimensions in Aluminium Field Mount Housing 316 Stainless Steel Field Mount Housing
Figures 5 and 6 A B A B
Without integral meter 70 mm 120.8 mm 95.5 mm 146.3 mm
2.76 inch 4.76 inch 3.76 inch 5.76 inch
With integral meter 127 mm 210.8 mm 127 mm 210.8 mm
5.00 inch 8.30 inch 5.00 inch 8.30 inch
A
B
B
A
With meter
Without meter
142
(5.59)
40
(1.57)
59.5
(2.34)
60
(2.36)
94
(3.7)
115
(4.53)
PANEL
CABLE/CONDUIT
ENTRY 1/2" NPT
OPTIONAL M20 OR
3/4" NPT ADAPTOR
PROVIDE 2
BOLTS AND NUTS
M8 TO THE
FIXATION
PROCESS/SENSOR
ENTRY : 1/2" NPT
OPTIONAL M20 OR
3/4" NPT ADAPTOR
OPTIONAL 316 SS
WIRED ON TAG
FIELD MOUNT
HOUSING
Figure 5 - STT250 Wall Mounting Dimensions
EN0I-6032 5
A
B
CLEARANCE FOR CAP
REMOVAL
CLEARANCE FOR CAP
REMOVAL
A
B
With meter Without meter
142
(5.59) 14.9
(0.59)
61.8
(2.43)
40
(1.57)
191.5
(7.54)
60
(2.36)
39
(1.54)
94
(3.7)
14.9
(0.59)
115
(4.53)
129.5
(5.1)
OPTIONAL MOUNTING
BRACKET FOR 2" PIPE
CABLE/CONDUIT
ENTRY 1/2" NPT
OPTIONAL M20
OR 3/4" NPT
ADAPTOR
OPTIONAL 316 SS
WIRED ON TAG
PROCESS/SENSOR
ENTRY : 1/2" NPT
OPTIONAL M20 OR
3/4" NPT ADAPTOR
FIELD MOUNT
HOUSING
Figure 6 - STT250 Pipe Mounting Dimensions
29.2
(1.15)
36.7
(1.44)
39.2
(1.56)
″
″″
″G″
″″
″ DIN RAIL TOP HAT / ″
″″
″Ω
ΩΩ
Ω″
″″
″ DIN RAIL
EN0I-60326
33
(1.3)
24.1
(0.95)
(2.05)
52
"G" DIN RAIL
DIN RAIL
Optional DIN rail clip
STT250
TOP HAT /
STT250 MODULE INSTALLATION WITH DIN RAIL
Figure 7 - STT250DIN Rail Mounting Dimensions
Distributor :
Honeywell
Industrial Automation and Control
Helping You Control Your World
Honeywell Inc.
In the U.S.A.: Honeywell Industrial Automation and Control, 16404 North Black Canyon Hwy., Phoenix, AZ 85023, (602) 313-5000
In Europe: Honeywell Pace, 1 Avenue du Bourget, B-1140 Brussels, Belgium, (32-2) 728-211
Honeywell S.A., Zone Industrielle de Longpré, F-80084 Amiens Cédex 2, France, (33-3) 22-54-56-56
In Asia: Honeywell Asia Pacific Inc., N° 19, Toa Payoh, Lorong 8 #06-00, Singapore 1231, 354-6768
In the Mediterranean: Africa & Middle East Region, Honeywell SpA, Via Vittor Pisani 13, 20124 Milano, Italy, (39-2) 67731
In Canada: The Honeywell Centre, 155 Gordon Baker Rd., North York, Ontario M2H 3N7, 1-800-461-0013
In Latin America: Honeywell Inc., 14505 Commerce Way, Suite 500, Miami Lakes, Florida 33016-1556, (305) 3642300
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Honeywell STT250 is a versatile temperature transmitter designed for various industrial applications. It offers a wide range of housing options to accommodate different mounting requirements, including direct sensor head, pipe, or wall mounting. The transmitter can be used in general-purpose, intrinsically safe, or explosion-proof environments, making it suitable for hazardous locations. It also features local or remote indication options with analog or smart meters for precise temperature monitoring and display.
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