edc DT 550 User manual

EN - English
DT 550 Rev1.0 May20 Page 1 of 50
Instruction manual
Flow Sensor
DT 550

Foreword
DT 550 Rev1.0 May20 Page 2 of 50
I. Foreword
Dear customer,
thank you very much for deciding in favour of the DT 550. Please read this
installation and operation manual carefully before mounting and initiating the device
and follow our advice. A riskless operation and a correct functioning of the
DT 550 are only guaranteed in case of careful observation of the described
instructions and notes

Table of Content
DT 550 Rev1.0 May20 Page 3 of 50
II. Table of Content
I. Foreword .......................................................................................................................................... 2
II. Table of Content............................................................................................................................... 3
1Pictograms and Symbols ................................................................................................................. 5
2Signalwords according ISO 3864 and ANSI Z 535.......................................................................... 5
3Safety instructions............................................................................................................................ 6
3.1 Intended Use............................................................................................................................. 7
3.2 Installation and commissioning................................................................................................. 7
4Technical data.................................................................................................................................. 8
4.1 Signal circuits............................................................................................................................ 9
4.1.1 Modbus................................................................................................................................ 9
4.1.2 Current output...................................................................................................................... 9
4.1.2.1 Aktive........................................................................................................................... 9
4.1.2.2 Passive ........................................................................................................................ 9
4.1.3 Pulse.................................................................................................................................... 9
4.1.4 Alarm ................................................................................................................................... 9
4.2 Measuring range flow DT 550................................................................................................. 10
4.2.1 Maximum Flow Ranges „Low Speed“................................................................................ 11
1.1.1 Measuring range „Standard Version“ ................................................................................ 13
1.1.2 Measuring range „Max Version“ ........................................................................................ 15
1.1.3 Measuring range „High Speed Version“ ............................................................................ 17
5Dimensions..................................................................................................................................... 19
5.1 Dimension DT 550 .................................................................................................................. 19
6Installation ...................................................................................................................................... 20
6.1 Pipe/tube requirements........................................................................................................... 20
6.2 Inlet / outlet runs...................................................................................................................... 20
6.3 Installation DT 550.................................................................................................................. 21
6.3.1 ½“ welded nipple with ball valve ½“................................................................................... 21
6.3.2 Spot drilling collar with ball valve....................................................................................... 21
6.4 Installation of the Sensor ........................................................................................................ 22
6.4.1 Mounting DT 550 onto the ball valve................................................................................. 22
6.5 Alignment Display (Housing)................................................................................................... 23
6.6 Tightening torques .................................................................................................................. 23
7Connection diagram....................................................................................................................... 24
7.1 Cable glands - clamping ranges ............................................................................................. 24
7.2 Connector pin assignment ...................................................................................................... 24
7.3 Wire connection ...................................................................................................................... 26
7.3.1 General.............................................................................................................................. 26
7.3.2 Power supply..................................................................................................................... 26
7.3.3 Modbus RTU...................................................................................................................... 26
7.3.4 Modbus TCP (Ethernet) Optional PoE .............................................................................. 27
7.3.5 Pulse Output...................................................................................................................... 27

Table of Content
DT 550 Rev1.0 May20 Page 4 of 50
8Operation DT 550....................................................................................................................... 28
8.1Main menu (Home)................................................................................................................ 29
8.1.1 Intialization......................................................................................................................... 29
8.2 Main menu ............................................................................................................................. 29
8.3 Settings.................................................................................................................................. 30
8.3.1 Sensor Setup..................................................................................................................... 31
8.3.1.1 Input / change tube diameter..................................................................................... 31
8.3.1.2 Input / change consumption counter ......................................................................... 32
8.3.1.3 Definition of the units for flow, velocity, temperature and pressure........................... 32
8.3.1.4 Definition of the reference conditions........................................................................ 33
8.3.1.5 Setting of Zeropoint and Low-flow cut off.................................................................. 35
8.3.2 Modbus RTU...................................................................................................................... 36
8.3.3 Modbus TCP (Optional)..................................................................................................... 37
8.3.3.1 Setup ......................................................................................................................... 37
8.3.3.1.1 Network Setup DHCP........................................................................................... 37
8.3.3.1.2 Network Settings static IP..................................................................................... 38
8.3.3.1.3 Modbus TCP Settings........................................................................................... 39
8.3.3.2 Modbus Settings (2001…2005).............................................................................. 40
8.3.3.3 Values Register (1001 …1500) ................................................................................. 40
8.3.4 Pulse /Alarm ...................................................................................................................... 42
8.3.4.1 Pulse output............................................................................................................... 42
8.3.5 User Setup......................................................................................................................... 43
8.3.5.1 Password................................................................................................................... 43
8.3.5.2 Language................................................................................................................... 43
8.3.5.3 Display / Touch.......................................................................................................... 44
8.3.6 Advanced........................................................................................................................... 44
8.3.7 4 -20mA............................................................................................................................. 45
8.3.8 DT 550 Info........................................................................................................................ 47
8.4 MBus ...................................................................................................................................... 48
8.4.1 Change of communication settings ................................................................................... 48
8.4.2 Coding VIF (Value Information Field)................................................................................ 49
8.4.3 Default Settings communication........................................................................................ 49
8.4.4 Default values transmitted................................................................................................. 49
9Supplementary Documentation.................................................................................................. 50

Pictograms and Symbols
DT 550 Rev1.0 May20 Page 5 of 50
1 Pictograms and Symbols
General Warning symbol (Danger, Warning, Caution)
General note
Installation- and Instruction manual to consider (on Nameplate)
Installation- and Instruction manual to consider
2 Signal words according ISO 3864 and ANSI Z 535
Danger!
Imminent danger
As a consequence of incorrect handling: serious personal injury or death
Warning!
Possible hazard
As a consequence of incorrect handling: possible serious injury or death
Caution!
Imminent hazard
As a consequence of incorrect handling: possible personal injury or damage
Note!
Possible hazard
As a consequence of incorrect handling: possible personal injury or damage
Important!
Additional notes, information, tips
As a consequence of incorrect handling: Disadvantages in operation and maintenance,
no danger

Safety Instructions
DT 550 Rev1.0 May20 Page 6 of 50
3 Safety instructions
Please check whether this manual corresponds with the device type.
Please attend to all notes indicated in this instruction manual. It contains essential information,
which has to be followed during installation, operation and maintenance. Therefore this
instruction manual has to be read categorically by the technician as well as by the responsible
user/qualified personnel before installation, initiation and maintenance
Regional and national regulations respectively, have to be observed in addition to this instruction
manual if necessary.
This instruction manual must be available at any time at the operation site of the DT 550.
Ensure that the DT 550 operates within the permissible and listed limits on the nameplate.
Otherwise there is a risk to human and material, and it may occur functional and operational
disturbances
In case of any obscurities or questions with regard to this manual or the instrument please contact
manufacturer.
Warning!
Risk of injury in case of inadequate qualification!
Improper handling can result in significant personal injury and damage.
All activities described in this operating instructions manual must be carried out only by
qualified personnel qualifications described below.
Professionals (Technical staff)
The technical staff is based on his education/training, his knowledge of measurement and control
technology as well of the local regulations, standards and guidelines in the position to do the work as
described and to identify the possible hazards.
Special working conditions require further appropriate knowledge, e.g. of aggressive media.
Caution!
Malfunction of DT 550
Faulty installation and insufficient maintenance may lead to malfunctions of the DT 550 which may
affect the display and open to misinterpretation.
Danger!
Inadmissible operating parameters!
By exceeding or falling short of limits there is a risk for people and material, in addition there may
occur further functional and operational disturbances.
Measures:
•Make sure that the DT 550 operates only within the permissible and listed limits on the nameplate
•Ensure the operation within the performance data of DT 550 in connection with the application
•Do not exceed the admissible storage and transportation temperature.
Additional safety information:
•When installing and operating the relevant national regulations and safety rules must also be
observed.
In gas hazardous areas (explosive media) only the version DT 550 EX must be used.
When using the Flow-/ Consumption sensors DT 550 Ex in gas hazardous areas the special
requirements specified in the Ex documentation must be observed.

Safety Instructions
DT 550 Rev1.0 May20 Page 7 of 50
3.1 Intended Use
The instrument described in this manual is exclusively to use for measuring the thermal mass flow of
gases. At the same time, the gas temperature is measured too.
The DT 550 can be configured for measuring a predetermined range of pure gases or of
gas mixtures.
Consumption measurement of gases such as Air, oxygen, nitrogen, carbon dioxide, argon, etc.
and with ATEX approval explosive gases such as natural gas, methane, propane and hydrogen.
Improper or incorrect use the operational reliability will be canceled. The manufacturer is not liable for
any damage resulting by improper or incorrect use.
3.2 Installation and commissioning
•Installation, electrical installation, commissioning, operation and maintenance of the device
must only be carried by qualified personnel, which were authorized by the plant operator.
The personnel must read the operating instructions and understand and follow their
instructions.
•If carrying out welding work on the pipeline the grounding of the welding unit is not allowed to
be done over the DT 550 itself.
•The installer must ensure that the DT 550 is connected according to the electrical
connection diagrams properly. The sensor must be grounded, unless special protective
measures have been taken (e.g. galvanically isolated power supply)
•The existing/ applicable national regulations governing opening and repair of the device have
to be applied.
•When using the DT 550 (ATEX Version) hazardous areas, in addition with the standard
manual a separate Ex documentation is enclosed. The installation instructions and connection
values indicated in these must also be observed.
•The device fulfills the general safety requirements in accordance with EN 61010-1,
the EMC requirements of IEC / EN 61326 and NAMUR recommendation NE 43.

Technical data
DT 550 Rev1.0 May20 Page 8 of 50
4 Technical data
Measures: mass flow, consumption
flow speed, temperature
Measuring principle: thermal mass flow sensor
Medium temperature range: -40 ... 180°C Probe (ATEX-Version -20°C … 120°C)
Operating temperature range: -20 ... 70 °C
Operating pressure: 50 bar
Power supply: 18 … 36 VDC
Optional: PoE according to IEEE 802.3af, PD Class 2 (max.
6.5W), voltage from 36V to 57V DC
Power consumption: max. 5W
Output: Modbus RTU (acc. EIA/TIA-485 Standard)
2 x 4...20 mA active (optional passive) RL < 500Ohm
galvanically isolated pulse (Pulse weight freely selectable,
Alarm max. 48Vdc 0,5A (Relays: Normally Closed)
optional: Modbus TCP, HART, Profibus DP, ProfiNet,
Accuracy: ± 1,5 % m.v. ± 0,3 % f.s.
Standard version*
(m.v. of meas. value)
(f.s. of full scale)
Accuracy: ± 1,0 % m.v. ± 0,3 % f.s.
Precision version*
(m.v. of meas. value)
(f.s. of full scale)
Repeatability: 0,25% m.v in case of correct mounting (mounting aid,
position, inlet section
Accuracy indications: referred to ambient temperature 22°C +/-2°C, system
pressure 6bar
Response time: t90 < 3s
Display: 2“ TFT Color Display (320 x 240)
Screw in thread: G 1/2“ ISO 228, NPT 1/2“, R 1/2“, PT 1/2“
Material: Housing aluminum die cast,
probe stainless steel1,4571
Protection class IP67
* Reference conditions for Temperature and pressure can be freely set, standard conditions are 0 ° and 1013 mbar.

Technical data
DT 550 Rev1.0 May20 Page 9 of 50
4.1 Signal circuits
4.1.1 Modbus
•According Standard EIA/TIA-485
4.1.2 Current output
4.1.2.1 Active
•Galvanically isolated
•4 … 20 mA
•RL< 500 Ohm
4.1.2.2 Passive
•Galvanically isolated
•4 … 20 mA
•RL< 500 Ohm
•Vin 12-36Vdc
4.1.3 Pulse
•Galvanically isolated (dry contact)
•Passive: 48Vdc , 500 mA
•Max. pulse output freq. 50Hz
4.1.4 Alarm
•Galvanically isolated
•Max. 48Vdc, 500mA

Measuring range
DT 550 Rev1.0 May20 Page 10 of 50
4.2 Measuring range flow DT 550
The flow-/consumption sensor DT 550 is available in 4 different versions:
•Low Speed max. measuring range of 50 m/s
•Standard max. measuring range of 92,7 m/s
•Max–Version max. measuring range of 185.0 m/s
•High speed–Version max. measuring range of 224 m/s
The sensors are programmed to pipe inner diameter of 53,1 mm.
Measuring range Analogoue output Scaling
•Low Speed 0… 323,6 m³/h 4mA = 0 m³h, 20mA = 323,6 m³/h
•Standard 0 … 600 m³/h 4mA = 0 m³h, 20mA = 600 m³/h
•Max–Version 0 ... 1197,59 m³/h 4mA = 0 m³h, 20mA = 1197,59 m³/h
•Highspeed–Version 0 … 1450,06 m³/h 4mA = 0 m³h, 20mA = 1450,06 m³/h
In case of use in other inner pipe diameter the diameter, using the display version, the diameter has
to be set first.
The corresponding scale values for the respective version could be found in sections 4.2.1 to 4.32.4.
Example:
Pipe 1“, Inner diameter 25mm Measuring range Analog output Scaling
•Low Speed 0 … 65,9 m³/h 4mA = 0 m³h, 20mA = 65,9 m³/h
•Grundversion( Standard) 0 … 122,2 m³/h 4mA = 0 m³h, 20mA = 122,2 m³/h
•Max–Version 0 ... 243,88 m³/h 4mA = 0 m³h, 20mA = 243,88 m³/h
•Highspeed–Version 0 … 295,30 m³/h 4mA = 0 m³h, 20mA = 295,30 m³/h
For changing the inner pipe diameter and adjusting the 4…20mA scaling, please refer to chapter
“Operation”.

Measuring range
DT 550 Rev1.0 May20 Page 11 of 50
4.2.1 Maximum Flow Ranges “Low Speed“
Inner diameter
of the pipe
Low Speed (50 m/s)
Full scale value in in Nm³/h
Inch
mm
Air2)
160mm
Ar3)
CO23)
N23)
O23)
N2O3)
Natural
gas3)
Methan
1/2"
16,1
24,6
22,6
38,4
24,3
22,6
23,4
24,1
14,6
3/4"
21,7
48,1
44,2
75,1
47,6
44,2
45,8
47,1
28,4
1"
25,0
65,9
60,6
103,1
65,2
60,6
62,8
64,6
39,0
26,0
71,7
65,9
112,1
70,9
65,9
68,3
70,3
42,4
27,3
79,7
73,2
124,5
78,8
73,2
75,9
78,1
47,1
28,5
87,4
80,4
136,6
86,5
80,4
83,3
85,7
51,7
30,0
97,6
89,7
152,6
96,6
89,7
93,0
95,7
57,7
1 1/4"
32,8
118,0
108,5
184,5
116,8
108,5
112,5
115,8
69,8
36,0
143,6
132,1
224,6
142,1
132,1
136,9
140,9
85,0
36,3
146,2
134,5
228,6
144,7
134,5
139,4
143,4
86,5
1 1/2"
39,3
172,9
159,0
270,4
171,1
159,0
164,9
169,6
102,3
40,0
179,4
164,9
280,4
177,5
164,9
171,0
175,9
106,1
41,9
196,9
181,0
307,8
194,8
181,0
187,7
193,1
116,5
43,1
210,1
193,2
328,5
207,9
193,2
200,3
206,1
124,3
45,8
238,4
219,3
372,8
235,9
219,3
227,3
233,8
141,1
2"
50,0
286,3
263,3
447,6
283,3
263,3
272,9
280,8
169,4
51,2
300,6
276,4
469,9
297,4
276,4
286,5
294,8
177,9
53,1
323,7
297,6
506,1
320,3
297,6
308,6
317,5
191,5
54,5
341,4
313,9
533,8
337,8
313,9
325,5
334,8
202,0
57,5
403,1
370,7
630,3
399,0
370,7
384,4
395,4
238,6
60,0
417,3
383,8
652,5
413,0
383,8
397,9
409,3
247,0
64,2
479,5
441,0
749,8
474,6
441,0
457,2
470,3
283,8
2) Referred to DIN 1945 / ISO 1217 (20°C, 1000mbar) and compressed air.
3) Referred to DIN 1343: 0°C, 1013,25 mbar

Measuring range
DT 550 Rev1.0 May20 Page 12 of 50
Inner diameter
of the pipe
Low Speed (50 m/s)
Full scale value in in Nm³/h
Inch
mm
Air 2)
Air 3)
Ar3)
CO23)
N23)
O23)
N2O3)
Natural
gas3)
Methan
2 1/2"
65,0
492,2
452,6
769,5
487,1
452,6
469,2
482,7
291,2
70,3
577,8
531,3
903,4
571,8
531,3
550,9
566,7
341,9
71,1
591,0
543,5
924,1
584,9
543,5
563,5
579,7
349,7
76,1
678,7
624,1
1061,2
671,7
624,1
647,1
665,7
401,6
3"
80,0
751,9
691,4
1175,5
744,1
691,4
716,8
737,4
444,9
82,5
799,6
735,3
1250,2
791,3
735,3
762,3
784,2
473,2
84,9
846,8
778,7
1324,0
838,0
778,7
807,3
830,5
501,1
90,0
952,7
876,1
1489,6
942,8
876,1
908,3
934,4
563,8
4"
100,0
1177,6
1082,9
1841,2
1165,4
1082,9
1122,7
1155,0
696,9
107,1
1352,4
1243,7
2114,5
1338,4
1243,7
1289,4
1326,4
800,3
110,0
1426,6
1311,9
2230,5
1411,8
1311,9
1360,2
1399,2
844,2
5"
125,0
1844,5
1696,1
2883,8
1825,3
1696,1
1758,5
1809,0
1091,5
133,7
2110,1
1940,5
3299,2
2088,2
1940,5
2011,8
2069,6
1248,7
6"
150,0
2659,2
2445,4
4157,6
2631,6
2445,4
2535,3
2608,1
1573,6
159,3
2999,2
2758,0
4689,2
2968,0
2758,0
2859,4
2941,6
1774,8
182,5
3941,1
3624,2
6161,8
3900,1
3624,2
3757,4
3865,4
2332,1
190,0
4271,6
3928,2
6678,7
4227,3
3928,2
4072,6
4189,6
2527,8
8"
200,0
4738,8
4357,7
7409,0
4689,5
4357,7
4517,9
4647,7
2804,2
206,5
5051,8
4645,6
7898,4
4999,3
4645,6
4816,4
4954,8
2989,4
10"
250,0
7413,2
6817,1
11590,4
7336,1
6817,1
7067,7
7270,8
4386,8
260,4
8052,4
7404,9
12589,8
7968,7
7404,9
7677,1
7897,7
4765,0
12"
300,0
10687,7
9828,3
16710,1
10576,6
9828,3
10189,6
10482,4
6324,5
309,7
11390,0
10474,2
17808,1
11271,6
10474,2
10859,2
11171,2
6740,1
339,6
13695,5
12594,2
21412,7
13553,1
12594,2
13057,2
13432,4
8104,4
400,0
19000,4
17472,6
29706,8
18802,9
17472,6
18114,9
18635,4
11243,6
500,0
29688,1
27300,9
46416,9
29379,5
27300,9
28304,5
29117,7
17568,1
600,0
42750,8
39313,3
66840,4
42306,5
39313,3
40758,4
41929,6
25298,0
700,0
58188,6
53509,8
90977,1
57583,9
53509,8
55476,8
57070,8
34433,4
800,0
76001,4
69890,3
118827,3
75211,6
69890,3
72459,4
74541,4
44974,3
900,0
96189,3
88454,9
150390,8
95189,7
88454,9
91706,5
94341,5
56920,6
1000,0
118752,2
109203,6
185667,6
117518,1
109203,6
113217,9
116471,0
70272,3
2) Referred to DIN 1945 / ISO 1217 (20°C, 1000mbar) and compressed air.
3) Referred to DIN 1343: 0°C, 1013,25 mbar

Measuring range
DT 550 Rev1.0 May20 Page 13 of 50
1.1.1 Measuring range “Standard Version“
Inner diameter of pipe
Standard Version (92,7 m/s)
Full scale value in in Nm³/h
Inch
mm
Air 2)
Air 3)
Ar3)
CO23)
N23)
O23)
N2O3)
Methane3)
Natural
gas3)
1/2"
16,1
45,6
41,9
71,3
45,1
41,9
43,4
44,7
27,0
3/4"
21,7
89,1
81,9
139,3
88,2
81,9
84,9
87,4
52,7
1"
25,0
122,2
112,4
191,1
120,9
112,4
116,4
119,9
72,3
26,0
132,9
122,2
207,8
131,5
122,2
126,5
130,3
78,6
27,3
147,7
135,8
230,9
146,1
135,8
140,6
144,8
87,4
28,5
162,0
149,0
253,3
160,3
149,0
154,3
158,9
95,9
30,0
180,9
166,4
282,9
179,0
166,4
172,3
177,5
107,1
1 1/4"
32,8
218,8
201,2
342,1
216,5
201,2
208,4
214,6
129,5
36,0
266,3
244,9
416,4
263,5
244,9
253,6
261,2
157,6
36,3
271,1
249,3
423,9
268,3
249,3
258,2
265,9
160,4
1 1/2"
39,3
320,6
294,8
501,3
317,3
294,8
305,3
314,5
189,7
40,0
332,6
305,8
519,9
329,1
305,8
316,7
326,2
196,8
41,9
365,0
335,6
570,6
361,2
335,6
347,6
358,0
216,0
43,1
389,5
358,2
609,0
385,4
358,2
370,9
382,0
230,5
45,8
442,0
406,5
691,1
437,4
406,5
421,0
433,5
261,6
2"
50,0
530,8
488,1
829,8
525,2
488,1
505,5
520,6
314,1
51,2
557,2
512,4
871,2
551,4
512,4
530,7
546,5
329,7
53,1
600,1
551,8
938,2
593,8
551,8
571,5
588,6
355,1
54,5
632,9
582,0
989,5
626,3
582,0
602,7
620,8
374,5
57,5
747,4
687,3
1168,5
739,6
687,3
711,8
733,1
442,3
60,0
773,7
711,5
1209,7
765,6
711,5
736,8
758,9
457,9
64,2
889,1
817,6
1390,0
879,8
817,6
846,7
872,0
526,1
2) Referred to DIN 1945 / ISO 1217 (20°C, 1000mbar) and compressed air.
3) Referred to DIN 1343: 0°C, 1013,25 mbar

Measuring range
DT 550 Rev1.0 May20 Page 14 of 50
Inner diameter of
pipe
Standard Version (92,7 m/s)
Full scale value in in Nm³/h
Inch
mm
Air 2)
Air 3)
Ar3)
CO23)
N23)
O23)
N2O3)
Methane3)
Natural
gas3)
2 1/2"
65,0
912,5
839,1
1426,6
902,9
839,1
869,0
895,0
540,0
70,3
1071,2
985,1
1674,8
1060,0
985,1
1020,2
1050,7
633,9
71,1
1095,8
1007,7
1713,1
1084,3
1007,7
1043,5
1074,7
648,4
76,1
1258,3
1157,2
1967,3
1245,2
1157,2
1198,3
1234,2
744,6
3"
80,0
1394,0
1281,9
2179,4
1379,4
1281,9
1327,5
1367,2
824,9
82,5
1482,5
1363,3
2317,7
1466,9
1363,3
1411,8
1454,0
877,2
84,9
1570,0
1443,7
2454,5
1553,5
1443,7
1495,1
1539,8
929,0
90,0
1766,4
1624,3
2761,6
1747,9
1624,3
1682,1
1732,4
1045,3
4"
100,0
2183,3
2007,8
3413,5
2160,5
2007,8
2079,2
2141,4
1292,0
107,1
2507,4
2305,7
3920,1
2481,1
2305,7
2387,8
2459,2
1483,7
110,0
2645,0
2432,3
4135,3
2617,3
2432,3
2518,9
2594,2
1565,2
5"
125,0
3419,6
3144,7
5346,3
3383,8
3144,7
3256,6
3353,9
2023,6
133,7
3912,2
3597,6
6116,5
3871,3
3597,6
3725,7
3837,0
2315,1
6"
150,0
4930,2
4533,7
7708,0
4878,6
4533,7
4695,1
4835,4
2917,4
159,3
5560,5
5113,3
8693,4
5502,3
5113,3
5295,3
5453,6
3290,4
182,5
7306,7
6719,2
11423,6
7230,3
6719,2
6958,3
7166,4
4323,8
190,0
7919,6
7282,8
12381,8
7836,8
7282,8
7542,0
7767,5
4686,5
8"
200,0
8785,7
8079,2
13735,8
8693,8
8079,2
8366,8
8616,9
5199,0
206,5
9366,0
8612,9
14643,2
9268,0
8612,9
8919,4
9186,1
5542,4
10"
250,0
13744,0
12638,9
21487,8
13600,2
12638,9
13088,7
13480,0
8133,1
260,4
14929,1
13728,7
23340,6
14772,9
13728,7
14217,2
14642,3
8834,4
12"
300,0
19815,0
18221,7
30979,4
19607,7
18221,7
18870,1
19434,3
11725,6
309,7
21117,1
19419,1
33015,1
20896,1
19419,1
20110,1
20711,4
12496,1
339,6
25391,4
23349,7
39697,7
25125,7
23349,7
24180,6
24903,6
15025,5
400,0
35226,7
32394,1
55074,4
34858,0
32394,1
33546,9
34549,9
20845,6
500,0
55041,6
50615,8
86053,8
54465,7
50615,8
52417,0
53984,3
32571,2
600,0
79260,0
72886,8
123917,4
78430,6
72886,8
75480,5
77737,4
46902,5
700,0
107881,6
99207,0
168665,4
106752,8
99207,0
102737,4
105809,2
63839,5
800,0
140906,6
129576,5
220297,7
139432,2
129576,5
134187,6
138199,7
83382,2
900,0
178334,9
163995,2
278814,3
176468,9
163995,2
169831,2
174909,1
105530,6
1000,0
220166,6
202463,2
344215,1
217862,8
202463,2
209668,2
215937,1
130284,7
2) Referred to DIN 1945 / ISO 1217 (20°C, 1000mbar) and compressed air.
3) Referred to DIN 1343: 0°C, 1013,25 mbar

Measuring range
DT 550 Rev1.0 May20 Page 15 of 50
1.1.2 Measuring range ʺMax Versionʺ
Inner diameter of
pipe
Max Version (185,0 m/s)
Full scale value in in Nm³/h
Inch
mm
Air 2)
Air 3)
Ar3)
CO23)
N23)
O23)
N2O3)
Methane3)
Natural
gas3)
1/2"
16,1
91,0
83,7
142,2
90,0
83,7
86,7
89,2
53,8
3/4"
21,7
177,8
163,5
278,0
176,0
163,5
169,5
174,4
105,2
1"
25,0
243,9
224,3
381,3
241,3
224,3
232,5
239,2
144,3
26,0
265,2
243,9
414,6
262,4
243,9
252,8
260,1
156,9
27,3
294,7
271,0
460,8
291,7
271,0
281,0
289,1
174,4
28,5
323,3
297,3
505,5
320,0
297,3
308,3
317,1
191,3
30,0
361,1
332,0
564,5
357,3
332,0
344,3
354,1
213,7
1 1/4"
32,8
436,7
401,6
682,8
432,2
401,6
416,3
428,3
258,4
36,0
531,5
488,7
831,0
526,0
488,7
506,7
521,3
314,5
36,3
541,1
497,6
845,9
535,4
497,6
515,8
530,7
320,2
1 1/2"
39,3
639,8
588,4
1000,4
633,2
588,4
610,0
627,6
378,6
40,0
663,7
610,3
1037,7
656,8
610,3
632,7
650,9
392,7
41,9
728,4
669,8
1138,9
720,8
669,8
694,5
714,4
431,0
43,1
777,3
714,8
1215,4
769,3
714,8
741,1
762,4
460,0
45,8
882,2
811,2
1379,3
873,0
811,2
841,1
865,2
522,0
2"
50,0
1059,2
974,1
1656,1
1048,2
974,1
1009,9
1038,9
626,8
51,2
1112,1
1022,6
1738,7
1100,5
1022,6
1060,2
1090,7
658,1
53,1
1197,6
1101,3
1872,4
1185,1
1101,3
1141,8
1174,6
708,7
54,5
1263,1
1161,6
1974,9
1250,0
1161,6
1204,3
1238,9
747,5
57,5
1491,6
1371,7
2332,1
1476,1
1371,7
1422,1
1463,0
882,7
60,0
1544,1
1420,0
2414,2
1528,1
1420,0
1472,2
1514,5
913,7
64,2
1774,3
1631,7
2774,1
1755,9
1631,7
1691,6
1740,2
1050,0
2) Referred to DIN 1945 / ISO 1217 (20°C, 1000mbar) and compressed air.
3) Referred to DIN 1343: 0°C, 1013,25 mbar

Measuring range
DT 550 Rev1.0 May20 Page 16 of 50
Inner diameter of pipe
Max Version (185,0 m/s)
Full scale value in in Nm³/h
Inch
mm
Air 2)
Air 3)
Ar3)
CO23)
N23)
O23)
N2O3)
Methane3)
Natural
gas3)
2 1/2"
65,0
1821,0
1674,6
2847,2
1802,1
1674,6
1736,2
1786,1
1077,6
70,3
2137,9
1966,0
3342,5
2115,6
1966,0
2038,2
2096,8
1265,1
71,1
2186,8
2011,0
3419,0
2164,1
2011,0
2084,9
2144,8
1294,0
76,1
2511,2
2309,3
3926,3
2485,1
2309,3
2394,2
2463,0
1486,0
3"
80,0
2781,9
2558,2
4349,5
2753,0
2558,2
2652,3
2728,5
1646,2
82,5
2958,5
2720,6
4625,6
2927,8
2720,6
2820,6
2901,7
1750,7
84,9
3133,1
2881,2
4898,6
3100,6
2881,2
2987,1
3073,0
1854,1
90,0
3525,1
3241,7
5511,5
3488,5
3241,7
3360,8
3457,4
2086,0
4"
100,0
4357,2
4006,9
6812,5
4311,9
4006,9
4154,1
4273,5
2578,4
107,1
5003,9
4601,5
7823,5
4951,9
4601,5
4770,7
4907,8
2961,1
110,0
5278,6
4854,1
8253,0
5223,7
4854,1
5032,6
5177,2
3123,6
5"
125,0
6824,5
6275,7
10670,0
6753,6
6275,7
6506,4
6693,4
4038,4
133,7
7807,5
7179,7
12207,0
7726,4
7179,7
7443,7
7657,5
4620,1
6"
150,0
9839,0
9047,9
15383,2
9736,8
9047,9
9380,5
9650,0
5822,3
159,3
11096,9
10204,6
17349,9
10981,6
10204,6
10579,7
10883,7
6566,7
182,5
14581,9
13409,4
22798,7
14430,4
13409,4
13902,4
14301,8
8628,9
190,0
15805,1
14534,2
24711,1
15640,8
14534,2
15068,5
15501,5
9352,7
8"
200,0
17533,5
16123,6
27413,4
17351,3
16123,6
16716,3
17196,7
10375,5
206,5
18691,7
17188,7
29224,2
18497,4
17188,7
17820,6
18332,6
11060,9
10"
250,0
27428,8
25223,2
42884,5
27143,7
25223,2
26150,4
26901,8
16231,1
260,4
29793,8
27398,1
46582,2
29484,2
27398,1
28405,2
29221,4
17630,6
12"
300,0
39544,5
36364,7
61827,4
39133,6
36364,7
37701,5
38784,8
23400,7
309,7
42143,0
38754,3
65890,2
41705,1
38754,3
40179,0
41333,5
24938,4
339,6
50673,3
46598,7
79227,1
50146,7
46598,7
48311,6
49699,8
29986,2
400,0
70301,3
64648,4
109915,3
69570,8
64648,4
67024,9
68950,8
41601,2
500,0
109845,8
101013,2
171742,6
108704,3
101013,2
104726,4
107735,6
65001,8
600,0
158177,9
145459,0
247309,4
156534,3
145459,0
150806,1
155139,3
93602,6
700,0
215297,7
197985,8
336615,6
213060,5
197985,8
205263,8
211161,8
127403,5
800,0
281205,2
258593,7
439661,2
278283,1
258593,7
268099,7
275803,2
166404,6
900,0
355900,4
327282,7
556446,2
352202,1
327282,7
339313,7
349063,4
210605,9
1000,0
439383,1
404052,7
686970,6
434817,4
404052,7
418905,8
430942,5
260007,2
2) Referred to DIN 1945 / ISO 1217 (20°C, 1000mbar) and compressed air.
3) Referred to DIN 1343: 0°C, 1013,25 mbar

Measuring range
DT 550 Rev1.0 May20 Page 17 of 50
1.1.3 Measuring range “High Speed Version“
Inner diameter of pipe
High Speed Version (224,0 m/s)
Full scale value in in Nm³/h
Inch
mm
Air 2)
Air 3)
Ar3)
CO23)
N23)
O23)
N2O3)
Methane3)
Natural
gas3)
1/2"
16,1
110,2
101,3
172,2
109,0
101,3
105,0
108,0
65,2
3/4"
21,7
215,3
198,0
336,7
213,1
198,0
205,3
211,2
127,4
1"
25,0
295,3
271,6
461,7
292,2
271,6
281,5
289,6
174,7
26,0
321,1
295,3
502,0
317,8
295,3
306,1
314,9
190,0
27,3
356,9
328,2
557,9
353,1
328,2
340,2
350,0
211,2
28,5
391,5
360,0
612,1
387,4
360,0
373,2
384,0
231,7
30,0
437,2
402,0
683,6
432,7
402,0
416,8
428,8
258,7
1 1/4"
32,8
528,7
486,2
826,7
523,3
486,2
504,1
518,6
312,9
36,0
643,5
591,8
1006,1
636,8
591,8
613,5
631,2
380,8
36,3
655,1
602,4
1024,3
648,3
602,4
624,6
642,5
387,7
1 1/2"
39,3
774,7
712,4
1211,3
766,7
712,4
738,6
759,8
458,5
40,0
803,6
739,0
1256,4
795,2
739,0
766,1
788,2
475,5
41,9
882,0
811,0
1378,9
872,8
811,0
840,9
865,0
521,9
43,1
941,2
865,5
1471,6
931,4
865,5
897,3
923,1
557,0
45,8
1068,1
982,2
1670,0
1057,0
982,3
1018,4
1047,6
632,1
2"
50,0
1282,5
1179,4
2005,2
1269,2
1179,4
1222,8
1257,9
758,9
51,2
1346,5
1238,2
2105,2
1332,5
1238,2
1283,7
1320,6
796,8
53,1
1450,1
1333,5
2267,1
1435,0
1333,5
1382,5
1422,2
858,1
54,5
1529,4
1406,4
2391,2
1513,5
1406,4
1458,1
1500,0
905,0
57,5
1806,1
1660,8
2823,8
1787,3
1660,8
1721,9
1771,4
1068,8
60,0
1869,6
1719,3
2923,2
1850,2
1719,3
1782,5
1833,7
1106,4
64,2
2148,4
1975,6
3359,0
2126,1
1975,6
2048,3
2107,1
1271,3
2) Referred to DIN 1945 / ISO 1217 (20°C, 1000mbar) and compressed air.
3) Referred to DIN 1343: 0°C, 1013,25 mbar

Measuring range
DT 550 Rev1.0 May20 Page 18 of 50
Inner diameter of pipe
High Speed Version (224,0 m/s)
Full scale value in in Nm³/h
Inch
mm
Air 2)
Air 3)
Ar3)
CO23)
N23)
O23)
N2O3)
Methane3)
Natural
gas3)
2 1/2"
65,0
2204,9
2027,6
3447,4
2182,0
2027,6
2102,2
2162,6
1304,8
70,3
2588,6
2380,4
4047,2
2561,7
2380,4
2467,9
2538,8
1531,8
71,1
2647,8
2434,9
4139,8
2620,3
2434,9
2524,4
2596,9
1566,8
76,1
3040,6
2796,1
4754,0
3009,0
2796,1
2898,9
2982,2
1799,3
3"
80,0
3368,4
3097,5
5266,4
3333,4
3097,5
3211,4
3303,7
1993,3
82,5
3582,2
3294,2
5600,7
3545,0
3294,2
3415,2
3513,4
2119,8
84,9
3793,6
3488,6
5931,3
3754,2
3488,6
3616,8
3720,8
2244,9
90,0
4268,2
3925,0
6673,3
4223,9
3925,0
4069,3
4186,2
2525,8
4"
100,0
5275,8
4851,5
8248,6
5220,9
4851,6
5029,9
5174,4
3122,0
107,1
6058,8
5571,6
9472,8
5995,8
5571,6
5776,4
5942,4
3585,3
110,0
6391,3
5877,4
9992,8
6324,9
5877,4
6093,5
6268,6
3782,1
5"
125,0
8263,2
7598,7
12919,4
8177,3
7598,8
7878,1
8104,4
4889,8
133,7
9453,4
8693,3
14780,3
9355,2
8693,3
9012,9
9271,8
5594,1
6"
150,0
11913,2
10955,3
18626,2
11789,4
10955,3
11358,0
11684,4
7049,7
159,3
13436,3
12355,9
21007,4
13296,6
12355,9
12810,1
13178,1
7951,0
182,5
17656,0
16236,3
27604,9
17472,5
16236,3
16833,1
17316,8
10448,0
190,0
19137,0
17598,2
29920,4
18938,1
17598,2
18245,1
18769,3
11324,4
8"
200,0
21229,7
19522,7
33192,4
21009,1
19522,7
20240,3
20821,9
12562,8
206,5
22632,1
20812,3
35385,0
22396,9
20812,3
21577,3
22197,3
13392,6
10"
250,0
33211,0
30540,6
51925,1
32865,9
30540,6
31663,2
32573,0
19652,8
260,4
36074,6
33173,9
56402,2
35699,7
33174,0
34393,4
35381,6
21347,3
12"
300,0
47880,9
44030,8
74861,2
47383,3
44030,9
45649,4
46961,1
28333,8
309,7
51027,2
46924,2
79780,5
50497,0
46924,3
48649,1
50047,0
30195,6
339,6
61355,7
56422,1
95929,0
60718,1
56422,3
58496,2
60177,1
36307,5
400,0
85121,6
78277,0
133086,6
84237,0
78277,2
81154,5
83486,4
50371,1
500,0
133002,5
122307,8
207947,8
131620,4
122308,1
126803,9
130447,5
78704,9
600,0
191523,6
176123,3
299444,9
189533,3
176123,7
182597,6
187844,3
113335,0
700,0
260684,8
239723,3
407577,7
257975,9
239724,0
248535,6
255677,0
154261,5
800,0
340486,3
313108,0
532346,4
336948,1
313108,8
324618,0
333945,5
201484,4
900,0
430928,0
396277,3
673750,9
426450,0
396278,4
410844,6
422649,7
255003,8
1000,0
532009,9
489231,3
831791,3
526481,5
489232,6
507215,6
521789,8
314819,5
2) Referred to DIN 1945 / ISO 1217 (20°C, 1000mbar) and compressed air.
3) Referred to DIN 1343: 0°C, 1013,25 mbar

Dimension
DT 550 Rev1.0 May20 Page 19 of 50
5 Dimensions
5.1 Dimension DT 550
Sensor lenght
L [mm]
H [mm]
C1
220
441
C2
300
521
C3
400
621
C4
500
721
C5
600
821
C7
160
381
156 (max)
(max)
138 (max)Ex version
(max)
132 (max)
(max)
H max
L

Installation
DT 550 Rev1.0 May20 Page 20 of 50
6 Installation
6.1 Pipe/tube requirements
•Correctly sized gaskets
•Correct aligned flanges and gaskets
•Diameter mismatch at the pipe junctions should be avoided but must be less than 1mm. For
further information see ISO 14511
•Ensure clean pipes after installation
6.2 Inlet / outlet runs
The principle of thermal Mass flow measurement is very sensitive against disturbances. Therefore, it is
necessary to ensure the recommended inlet and outlet runs.
Table Inlet / Outlet runs
Flow obstruction before the measurement
section
Min length
Inlet run (L1)
Min length
Outlet run (L2)
Slight curve
(ellbow < 90°)
12 x D
5 x D
Reduction
(Pipe narrows to the measurement section)
15 x D
5 x D
Expansion
(Pipe expands to the measurement section)
15 x D
5 x D
90° ellbow or T-piece
15 x D
5 x D
2x ellbow á 90°
in einer Ebene
20 x D
5 x D
2x ellbow á 90°
3-dimensional
35 x D
5 x D
Control valve
45 x D
5 x D
15 x D 5 x D
15 x D 5 x D15 x D
15 x D 5 x D
20 x D 5 x D
35 x D 5 x D
5 x D45 x D
The values represent the min. lengths. In case the min. inlet / outlet runs could not be ensured, it must
be expected to get increased or significant deviations of the measurement values.
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