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Technical Datasheet
TD 00055E/24/EN/01.13
• Three buttons for local set-up, via
ReadWin® 2000 configuration
software or FieldCare
• On-site display
• High reproducibility and long-term
stability
• Large turndown
• Negligible pressure loss
Complete product information:
www.e-direct.us/dtt31
Specs at a glance:
• Medium: Liquids
• Measuring range:
0.1 to 9.84 ft/s
• Medium temperature:
-4 to +185 °F
• Process pressure:
0 to 1450 psi (at 20 °C)
Flow switch for monitoring of mass flow
Flowphant T DTT31
$ 396.00

2. Flowphant T DTT31 2
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Application / Function
Application The Flowphant T DTT31
is a flow switch for monitoring,
displaying and measuring relative
mass flow rates of liquid media in the
range from 0.03 to 3 m/s (0.1 to 9.84
ft/s). Application examples include:
Monitoring cooling water circulation
systems of pumps, turbines,
compressors and heat exchangers and
monitoring lubrication systems.
Function The device measures the
mass flow of a liquid medium with the
calorimetric measurement method.
The calorimetric measuring principle
is based on cooling a heated
temperature sensor. Heat is removed
from the sensor by forced convection
due to medium flowing by. The extent
of this heat transfer depends on the
medium velocity and the difference in
temperature between the sensor and
medium (King’s law). The higher the
velocity or the mass flow of the
medium, the greater the temperature
sensor cooling.

3. Flowphant T DTT31 3
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DimensionsTechnical data
Technical data Dimensions (in inches)
Input
Measurement range 0 to 100 %; resolution 1 %
0.03 to 3 m/s (0.1 to 9.84 ft/s) for liquids
Output
Output signal 1×PNP, 2×PNP or 1×PNP with analog
output for flow and temperature
Voltage drop PNP ≤ 2 V
Overload protection Automatic testing
Performance characteristics
Reference conditions According to DIN IEC 60770/61003
Measured error Switch point and display 0.2 %
Long-term drift ≤ 0.5 % per year under reference operating
conditions
Sensor reaction time 6 to 12 s
Response time Switch output 100 ms
Operating conditions
Medium temperature -20 to +85 °C (-4 to +185 °F)
Ambient temperature -40 to +85 °C (-40 to +185 °F)
Degree of protection With M16×1.5 valve plug: IP 65
with M12×1: IP 66
Power supply
Supply voltage Ub 18 to 30 V DC, reverse polarity protection
Current consumption Without load < 100 mA at 24 V DC
General
EMC Interference emission as per IEC 61326
Series, class B electrical equipment;
interference immunity as per IEC 61326
Series, appendix A (indust. use) and NAMUR
Recomm. NE 21
Operating elements 3 buttons or PC and software
Materials Process connection, protecting tube and
housing 316L
Approvals
Desina compliant
L L
1.52
M12×1
Housing
M16×1.5
1.42
2.05
3.82
1.66
0.95
1.52
0.95
Ø 0.24Ø 0.24Ø 0.24
Ø 1.66
Ø 1.52
L
L = sensor length 1.16", 3.94"
Installation according to instruction manual.
L
AA
(Without*)
AB
(ISO 228 G ¼ A, 316L)
AE
(ISO 228 G ½ A, 316L)
AF14 AF27
Process connections
* For mounting with welding boss or compression fitting: 3.94"
0.47
0.55
A1
A2
A2‘
A3
B
R
2
3
1
4
2
3
1
4
R1
R1
L+
L–
L+
L–
1
2
3
3
1
1
2
4
L+
L–
L+
L–
R1
4…20 mA
Electrical connection
DC voltage version with M12×1 connector
A1: 1×PNP switch output
A2: 2×PNP switch outputs R1 and (1) (R2)
A2’: 2×PNP switch outputs R1 and (1)
(diagnosis/break contact with adjustment „DESINA”)
A3: PNP switch output, additional analog output
DC voltage version with valve plug M16×1.5
B: 1×PNP switch output

4. Flowphant T DTT31 4
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Price table (DTT31)
Flowphant DTT31 Order no. Price/pcs. in USD
Process Connection Electrical Connection Power Supply; Output 1 to 5 6 to 10 11 to 35
w/o; Compr. fitting,
316L, L=>100mm
insertion length
Compr. fitting, to
order separately
Plug M12 18-30VDC; 1x switch PNP DTT31-A1A111AA2CAB 450.00 419.00 396.00
18-30VDC; 2x switch PNP DTT31-A1B111AA2CAB 484.00 450.00 426.00
18-30VDC; switch PNP +
4-20mA
DTT31-A1C111AA2CAB 562.00 523.00 495.00
Plug ISO4400
M16x1.5
18-30VDC; 1x switch PNP DTT31-A2A111AA2CAB 484.00 450.00 426.00
Plug ISO4400 NPT½ 18-30VDC; 1x switch PNP DTT31-A3A111AA2CAB 484.00 450.00 426.00
With thread ANSI
NPT
Plug M12 18-30VDC; 1x switch PNP DTT31-A1A111D 2AAB 461.00 428.00 405.00
18-30VDC; 2x switch PNP DTT31-A1B111D 2AAB 495.00 460.00 435.00
18-30VDC; switch PNP +
4-20mA
DTT31-A1C111D 2AAB 573.00 532.00 504.00
Plug ISO4400
M16x1.5
18-30VDC; 1x switch PNP DTT31-A2A111D 2AAB 495.00 460.00 435.00
Plug ISO4400 NPT½ 18-30VDC; 1x switch PNP DTT31-A3A111D 2AAB 495.00 460.00 435.00
Plug and cable to be ordered as ‘accessory’
* Please add code for process connection.
Accessories Order no. Price/pcs. in USD
Compression fitt.kpl. welded d6 PEEK sealed compression fitting 51004751 86.00
Process connection G½” sealed compression fitting 51004753 66.00
Cable M12x1 l=5m
5m cable 4x 0.34 mm2, molded PVC angled connector, M12x1 connector
screw Cu Sn/Ni, IP67.
51005148 20.00
Configuration kit TXU10-for PC-programmable devices.
set-up programme+interface cable for PC with USB-Port. 4 pin plug +
ReadWin® 2000
TXU10-AA 204.00
Socket for plug 4p-125V, 4A-M12
M12 socket for plug. Self confectionery connection. Usage: Plug M12.
52006263 22.50
M12 elbow plug ready for cable, IP67, PG7 51006327 16.00
Prices valid until 09.30.2013 in U.S. dollars per unit (not including shipping and applicable sales tax).
See Endress+Hauser, Inc. Terms and Conditions of Sale for shipping, tax, and payment terms.
Complete product information:
www.e-direct.us/dtt31
*
Process connections
Code Thread
A ANSI NPT ¼”, 316L
E ANSI NPT ½”, 316L
*
More products to complete your measuring point … Temperature switch
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Flow measuring system
Proline Promag 10D

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Contact
E-direct
Endress+Hauser, Inc.
2350 Endress Place
Greenwood, IN 46143
Direct order
Internet www.e-direct.us
by phone 888-EH-DIRECT
(343-4732)
per Fax 317-535-8498
E-Mail e-direct@us.endress.com