Endress+Hauser Flowphant T DTT31 Handbuch

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TI00125R/09/EN/02.14

71252099

Technical information

Flow switch

Flowphant T DTT31, DTT35

Flow switch for safe monitoring of mass flow and

temperature in industrial processes

Application

Flow switch for monitoring and displaying relative mass flow rates of liquid media in

the range from 0.03 to 3 m/s (0.1 to 9.84 ft/s):

Flowphant T DTT31 −with thread connections or coupling

Flowphant T DTT35 −with process connections for hygienic applications

Application examples:

• Monitoring cooling water circulation systems of pumps, turbines, compressors and

heat exchangers

• Monitoring pump functionality

• Leak monitoring in process lines

• Monitoring lubrication systems

• Filter monitoring in the beverage industry

Benefits at a glance

This compact flow switch impresses with the latest in technology being used:

• Practically no pressure loss

• Configuration software ReadWin 2000 or FieldCare for quick configuration and

reliable storage of device settings

• Optional: 4 to 20 mA analog output to read out the flow rate as percentage value

• Optional: second switch output or 4 to 20 mA analog output for temperature

monitoring

• Function check and process information onsite thanks to digital display at device

• Top housing section which can be rotated 310° and rotatable display make it possible

to read the measured values in all orientations

• DTT35: 3-A marked

DTT31, DTT35

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Function and system design

Measuring principle

A0023188

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.

Measuring system Overview

Flowphant

product family

DTT31 DTT35

A0005276 A0023194

Measurement

probe

RTD RTD

Field of

application

Monitoring of the mass flow of water,

water-like substances and low-viscosity oils

(viscosity: 0.184 to 20.0 mPa*s; thermal

conductivity: 29 to 688 mW/mK). Example:

Aqueous solution monoethylenglycol (20

vol%) at 20 °C: Viscosity: 1.65 mPa*s;

thermal conductivity: 512 mW/mK

Monitoring of the mass flow of liquid

media in hygienic processes (viscosity:

0.184 to 20.0 mPa*s; thermal

conductivity: 29 to 688 mW/mK).

Example: Aqueous solution

monoethylenglycol (20 vol%) at 20 °C:

Viscosity: 1.65 mPa*s; thermal

conductivity: 512 mW/mK

Process

connection

• Compression fitting

•Thread:

−G½" and G¼"

−ANSI NPT ¼" and NPT ½"

•Hygiene:

−Conical metal-metal G½"

−Clamp 1" - 1½", 2"

−Varivent F, N

−DIN 11851

−APV-Inline

DTT31, DTT35

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DC voltage version

PNP switch output of electronics.

Power supply e.g. with a power supply unit.

Preferably in conjunction with programmable logic controllers (PLC) or for controlling a relay.

A0005373

A: 1x PNP switch output

B: 2x PNP switch output

C: PNP switch output with additional analog output 4 to 20 mA

Transmitter power supply unit, e.g. RNB130

Load (e.g. programmable logic controller, process control system, relay)

Display e.g. RIA452 or recorder e.g. Ecograph T or Minilog B (at 4 to 20 mA analog output)

Power supply "Easy Analog RNB130":

Primary switched-mode power supply for sensors. Space saving DIN rail mounting as per IEC 60715.

Wide-range nominal voltage input: 100 to 240 V AC; Output: 24 V DC, max. 30 V in the event of a

fault; Nominal output current: 1.5 A. Connection to monophased a.c. networks or to two phase

conductors of three-phase supply networks.

Process display RIA452:

If you would like to read off the instantaneous value of the temperature not only locally, but also e.g.

directly from a control room or in the PC network, then one suitable device is the process display

RIA452:

Digital process display unit in 96 x 96 mm (3.78 x 3.78 in) panel mounted housing for monitoring and

displaying analog measured values with pump control and batch functions. Multicoloured 7-digit 14-

Measuring

range

Mass flow as a relative value between 0 and 100%.

Process measuring limit, liquids: 0.03 to 3 m/s (0.1 to 9.84 ft/s)

Flowphant

product family

DTT31 DTT35

RNB130

24V OV

IN AC

24V 13

RNB130

24V OV

IN AC

24V 13

2 3

RNB130

24V OV

IN AC

24V 13

DTT31, DTT35

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segment LC display with large bargraph. Configuration and visualisation via RS232 interface and

ReadWin 2000 PC operating software.

Universal Graphic Data Manager Ecograph T, Data logger Minilog B:

If you would like to read off the instantaneous value of the temperature not only locally, but also record,

analyze and display it e.g. directly from a control room or in the PC network, then the following devices

are suitable:

• Universal Graphic Data Manager Ecograph T

144 x 144 mm (5.67 x 5.67 in) panel mounted housing for electronic acquisition, display, recording,

analysis, remote transmission and archiving of analog and digital input signals. Multichannel data

recording system with multicoloured TFT display (145 mm (5.7 in) screen size), galvanically isolated

universal inputs (U, I, TC, RTD, pulse, frequency), digital inputs, transmitter power supply, limit relay,

communication interfaces (USB, Ethernet, optional RS232/485), 128 MB internal memory, external

SD card and USB stick. The Field Data Manager Software (FDM) supports data analysis at the PC;

configuration is done via FieldCare or the integrated web server.

• Data logger Minilog B

Battery powered measured value collector with 2 input channels for storing analog and digital

values. Internal memory 128 kB for max. 84000 measured values. Configuration and visualisation

via RS232 interface and ReadWin 2000 PC operating software. Optionally with telealarm function.

Input

Measured variable • Flow velocity of liquid media (calorimetric measuring principle)

• Temperature (RTD), optional for two switch outputs or additional analog output

Measuring range • Flow: 0.03 m/s to 3 m/s (0.1 to 9.84 ft/s), as relative value between 0 and 100%; maximum display

resolution: 1%

• Temperature: -20 °C to +85 °C (-4 to +185 °F); display resolution: 1 °C (1 °F)

Output

Output signal DC voltage version: (short-circuit proof version)

• 1x PNP switch output (flow) or

• 2x PNP switch outputs (flow or temperature, adjustable) or

• 1x PNP switch output and 1x 4 to20 mA output, active (flow or temperature, adjustable)

Signal on alarm Signal on alarm as per NAMUR NE43

• Underranging: Linear drop to 3.8 mA

• Overranging: Linear rise to 20.5 mA

• Sensor break; sensor short-circuit:

≤3.6 mA or ≥21.0 mA (at settings ≥21.0 mA, 21.7 mA output is guaranteed)

• Switch outputs: at safety condition (switch open)

Load Max. (Vpower supply - 6.5 V) / 0.022 A (current output)

Range of adjustment • Switch output

Switch point (SP) and switchback point (RSP) in increments of 1% with min. hysteresis of 5%

• Damping: freely adjustable: 0 = off (no damping) or 10 to 40 s in increments of 1 second

• Unit: %, optional °C, °F (with two outputs and temperature monitoring)

The analog output reads out the measured flow rate as relative value in percentage of the

adjusted measuring range.

DTT31, DTT35

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Switching capacity DC voltage version:

• Switch status ON: Ia≤250 mA, switch status OFF: Ia≤1 mA

• Switching cycles: > 10,000,000

• Voltage drop PNP: ≤2 V

• Overload protection

Automatic testing of switching current; output is switched off in case of overcurrent, the switching

current is tested again every 0.5 s; max. capacitance load: 14 μF for max. supply voltage (without

resistive load)

Periodic disconnection from a protective circuit in event of overcurrent (f = 2 Hz) and indication of

’Warning’

Inductive load To prevent electrical interference, only operate an inductive load (relays, contactors, solenoid valves)

when directly connected to a protective circuit (free-wheeling diode or capacitor).fdg

Power supply

Electrical connection Plug connection

A0023196

A: M12x1 connector

B: Valve connector M16x1.5 or NPT ½"

Device connection

• DC voltage version with M12x1 connector

A0006818

DTT35: Electrical cables must comply with 3-A standard, must be smooth, corrosion resistant

and cleanable.

M16x1.5 / NPT ½”

M12x1

4...20 mA

L–

L+

4R1 m

A1 A2

A2’

DTT31, DTT35

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• DC voltage version with valve connector M16x1.5 or NPT ½"

P01-PTx3xxxx-04-xx-xx-xx-003

Supply voltage DC voltage version

18 up to 30 V DC (reverse polarity protection)

Current consumption < 100 mA (without load) at 24 V DC, max. 150 mA (without load); with reverse polarity protection

Power supply failure • Behaviour in case of overvoltage (> 30 V)

The device works continuously up to 34 V DC without any damage.

No damage is caused to the device in case of a short-term overvoltage up to 1 kV (as per EN 61000-

4-5).

The specific properties are no longer guaranteed if the supply voltage is exceeded.

• Behaviour in case of undervoltage

If the supply voltage drops below the minimum value, the device switches off (status as if not

supplied with power = switch open).

Performance characteristics

The percentage information in the "Performance characteristics" section refers to the full scale value or

the set maximum value (100% value) of the monitoring range.

Reference operating

conditions

As per DIN IEC 60770 or DIN IEC 61003

T = 25 °C ± 5 °C (77 °F ± 9 °F), relative humidity 45 to 75 %, ambient air pressure 860 to 1060 kPa

(124 to 153 PSI), water test medium. Supply voltage U = 24 V DC.

Maximum measured error Flow

The device records fluid velocity relatively in relation to a set monitoring range of the flow (0 to 100 %

as display value). An absolute measurement of the fluid velocity or the mass flow is not possible. The

sensitivity of the calorimetric flow sensor changes with the fluid velocity. It increases with decreasing

Item No. Output setting Order code (see Ordering information

section)

A1 1x PNP switch output DTT3x-A1A*******

A2 2x PNP switch output R1 and m (R2) DTT3x-A1B*******

A2’ 2x PNP switch output R1 and m (diagnosis/NC

contact with "DESINA" setting)

DTT3x-A1B*******

A3 1x PNP switch output and 1x analog output

(4 to 20 mA)

DTT3x-A1C*******

Item No. Output setting Order code (see Ordering information

section)

B 1x PNP switch output DTT3x-A2A*******; DTT3x-A3A*******

DTT31, DTT35

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fluid velocity (for example, with water, the greatest sensor sensitivity is recorded in the range from

0.03 to 0.5 m/s).

A0008181-EN

Standard characteristic

A, B: Set monitoring ranges of the flow (example)

LOWF 0%: Setting for the minimum fluid velocity occurring in the monitoring range A or B (0% value)

HIF 100%: Setting for the maximum fluid velocity occurring in the monitoring range A or B (100% value)

Temperature

• Accuracy: 2 K (3.6 °F)

• Repeatability: 1 K (1.8 °F)

• Influence of medium temperature: 0.05 %/K of full scale value

Switch point non-

repeatability

Temperature gradient In the event of a temperature change of ≥0.5 K/min in the medium, temporary display drifts are

possible which can exceed the specified non-reproducibility values of the switch point.

Sensor reaction time 6 to 12 s

Long-term drift 0.5% per year under reference operating conditions

LOWF 0%

HIF 100%

LOWF 0%

HIF 100%

Flow rate

Sensor signal

Measuring range

(water as medium)

% of maximum value Influence of

medium temperature1)

1) The values indicated only apply to the device itself without taking the temperature-dependent change of the

thermo-physical properties of the medium into account. For this reason, we recommend you commission

the device at the process temperature and set the switch points (see 'Learn function' →ä13)

Influence of

ambient temperature

0.03 to 0.5 m/s

(0.1 to 1.6 ft/s)

≤2 %2)

2) For a Reynolds number > 10,000

0.05 %/K 0.04 %/K

0.03 to 1 m/s

(0.1 to 3.28 ft/s)

≤3 %2) 0.10 %/K 0.05 %/K

0.03 to 2 m/s

(0.1 to 6.56 ft/s)

≤5 %2) 0.15 %/K 0.10 %/K

0.03 to 3 m/s

(0.1 to 9.84 ft/s)

≤10 %2) 0.20 %/K 0.30 %/K

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Long-term reliability

Switch output response time 100 ms

Analog output • Maximum measured error = switch point error and display error + 0.1%

•RisetimeT

90: ≤200 ms

• Settling time T99: ≤500 ms

Operating conditions: Installation instructions

Installation instructions

• Electrical rotation of display by 180°

• Housing can be rotated up to 310 ° mechanically

Orientation No restrictions, but self draining.

Mean time between failure (MTBF) calculated according to SN29500 (at 40 °C)

Low stress environment: <0.1G 227 years

High stress environment: >0.1G 48 years

• The sensor tip should be completely surrounded by

medium.

• Position the sensor tip in the area of maximum fluid

velocity (pipe center).

• Minimum sensor immersion length: Li≥10 mm (0.4 in)

A0006976

Installation conditions

Orientation

• For horizontal pipes: lateral installation.

Installation from above only if the pipe is completely

filled with medium.

• For vertical pipes: installation in the ascending pipeline.

• DTT35: min. 3° inclination, because of self draining.

A0006977

Correct orientation

NOTICE

Do not install in down pipes open towards the end.

The sensor tip should never touch the pipe wall.

A0006978

Incorrect installation!

3°=

DTT31, DTT35

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Inlet and outlet run

NOTICE

The thermal measuring principle is sensitive to disturbed flow conditions.

‣As a general rule, install the measuring device as far away as possible from any flow disturbances.

For further information →ISO 14511.

‣If possible, install the sensor upstream from fittings such as valves, T-pieces, elbows, etc.

‣To attain the specified level of accuracy of the measuring device, the inlet and outlet runs

mentioned below must be maintained at the very minimum.

‣If there are several flow disturbances present, the longest specified inlet run must be maintained.

A0023225

1Reduction

2Expansion

3 90° elbow or T-section

4Pump

5 Control valve

6 2x 90° elbow 2- or 3-dimensional

Operating conditions: Environment

Ambient temperature range –40 to +85 °C (-40 to +185 °F)

Storage temperature –40 to +85 °C (-40 to +185 °F)

Climate class 4K4H as per DIN EN 60721-3-4

Degree of protection IP65 (optional IP66, depending on used connector)

Shock resistance 50 g as per DIN IEC 68-2-27 (11 ms)

Vibration resistance • 20 g as per DIN IEC 68-2-6 (10-2000Hz)

• 4 g as per German Lloyd GL Guidelines

Electromagnetic

compatibility

• Interference emission as per IEC 61326 Series, class B electrical equipment

• Interference immunity as per IEC 61326 Series, appendix A (industrial use) and NAMUR

Recommendation NE 21

EMC influence: ≤0.5 %

5 × DN 3 × DN

3 × DN

15 × DN

5 × DN

3 × DN 3 × DN

3 × DN

5 × DN

3 × DN

10 × DN

5 × DN

DTT31, DTT35

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Operating conditions: Process

Process temperature limits -20 to +85 °C (-4 to +185 °F)

The sensor can be exposed up to 130 °C (266 °F) without damage; monitoring switches off

automatically at T ≥85 °C (185 °F) and starts again at T ≤85 °C (185 °F).

Process pressure limits Maximum permitted process pressure pmax ≤10 MPa = 100 bar (1450 psi)

NOTICE

The maximum process pressure for the conical metal-metal process connection (MB option) for the

DTT35 is 1.6 MPa = 16 bar (232 psi)!

Process flow limit Liquids: 0 up to 3.0 m/s (0 up to 9.84 ft/s)

Operating range Liquids: 0.03 up to 3.0 m/s (0.1 up to 9.84 ft/s)

Mechanical construction

Design, dimensions DTT31,

DTT35

Dimensions

A0005279

All dimensions in mm (in)

L = Insertion length

Connector M12x1 as per IEC 60947-5-2

Valve connector M16x1.5 or NPT ½" as per DIN 43650A/ISO 4400

42.3 (1.66)

97.1 (3.82)

42.1 (1.66)

38.7 (1.52) 38.7 (1.52)

36 (1.42)

24 (0.95) 24 (0.95)

52 (2.05)

38.5 (1.52)

M16x1.5 / NPT ½”

M12x1

LL L

6 (0.24) 6 (0.24) 6 (0.24)

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