D-FL 100

Volume flow measuring system

Suitability-tested and certified impact pressure system to measure velocity and volume flow of dry flue gas or process gas in pipes or ducts.


  • In situ measurement, continuous measurement
  • Allows calibration to measure the volume flow
  • Cross duct, half duct and single point versions
  • Also suitable for thick-walled stone / insulated ducts
  • Probe is in contact with sample gas, backpurge as an option
  • Automatic zero check as an option
  • Universal operation unit D-ISC 100 as an option
  • Temperature and pressure sensor as option
  • Normalization of the flow measurements as an option
  • Very low maintenance


Suitable for velocity and volume flow measurement

  • at incinerators with dry fluegas in general
  • at installations in accordance with IED 2010/75/EU/ 17th BImschV
  • at garbage, hazardous waste and sewage sludge incinerators,
  • at facilities for cement production
  • at installations in accordance with 2001/80/EC LCPD / 13th BImschV / Clean Air Act
  • at power stations with gas, oil, coal or co-firing
  • at facilities pursuant to 27th BImschV
  • for processes, Ex zones, high temperature or high pressure applications

Technical Data

Sample gas typeAir, flue gas, non flammable process gas
Sample gas temperatureAbove dew point,
-20…450 °C (-4…842 °F) standard, other on request
Sample gas dust concentration0...30 mg/m3, type 1 (24x22mm) without backpurge
0...100 mg/m3, type 2 (54x50mm) without backpurge
0...150 mg/m3, type 3 (100x90mm) without backpurge
Inner duct pressure-50...+50 hPa (optional higher)
Sample gas relative humidity0…95 % RF, non-condensing
Sample gas flow velocity3…50 m/s
Stack/duct inner diameter0.5…10 m (1.6…32.8 ft)
Measuring principleMeasurement of ram pressure / differential pressure with a dual-chamber-probe.
Measuring principle descriptionMeasurement of ram pressure / differential pressure with a dual-chamber-probe with multiple measuring nozzles. Calculation of the gas speed and the volume flow dependent on measurement cross section, flew gas temperature and innder duct pressure.
ConformitiesIED 2010/75/EU
13., 17., 27., 30. BImschV
TA Luft
EN 14181
EN 15267-1, -2, -3
DIN EN 16911-2
CertificatesCE, QAL1 (DIN EN 14181 / DIN EN ISO 14956 / DIN EN 15267-3), MCERTS, EAC Gost Ex Zone 2
Measuring locationIn-situ, non-contact. Mounted at stack, measurement across the stack, half duct or single point, probe is in contact with flue gas.
Measuring path length0.4…8 m (1.3…26.3 ft)
Measuring angle90° -4° relative to the flow direction
Self-check, protective functionsAutomatic internal self-test
System componentsD-FL 100 DS probe
D-FL 100 DDM-H differential pressure transmitter
D-FL 100 UH valve
D-FL 100 A adaptor
D-FL 100-20 evaluation unit
D-ISC 100 operating unit or D-ESI software
D-FL 100 ADM-H absolute pressure transmitter (option)
D-XT temperature transmitter (option)
Physical measuring valueRam pressure / differential pressure
Derived measuring valuesFlow velocity, volume flow at operating conditions or normalized
Measuring range gas velocity3…50 m/s
Output range gas velocityFreely programmable
Measuring range volume flow0…3000000 Nm3/h
Output range volume flowFreely programmable
Measuring range temperature0…600 °C
Output range temperatureFreely programmable
Resolution0.1 m/s
Combined standard uncertainty acc. to QAL1, DIN EN 141810.71 m/s
Integration time1…180 s, freely programmable
Process connectionMounting tube with flange,
DN40 PN6 (system 1), tube ID = 43.1 mm, OD = 48.3 mm,
DN65 PN6 (system 2), tube ID = 70.3 mm, OD = 76.1 mm,
DN100 PN6 (system 3), tube ID = 107.1 mm, OD = 114.3 mm,
other on request
Digital interfacesRS 485 Modbus RTU, bi-directional communication, USB (Service)
Analog outputs1x 4-20 mA, 400 Ohm, isolated, assignment parameterisable
Digital outputs2 x contact NC/NO, permissible load 60 VDC / 30 VAC / 0.5 A, function can be assigned. Typically: maintenance, failure
Power supplySensor supply voltage 24 VDC ±10 %, 0.5 A,
90 - 264 VAC, 48 - 62 Hz (option)
Operation- D-ISC 100 universal operating unit
- D-ESI 100 software, requires notebook/tablet with Windows XP™ OS
Ambient temperature (operational)-20…+50 °C (-4…122 °F), optional higher
IP protection class (IEC 60529)IP65 (standard)
IP20 (evaluation unit M)
Dimensions (HxWxD)Evaluation unit A/P: 231 x 160 x 105 mm
Evaluation unit M: 62 x 90 x 54 mm
Probe 1: 24 x 22 x 400…2000 mm
Probe 2: 54 x 50 x 2000…4000 mm
Probe 3: 100 x 90 x 4000…8000 mm
Weight1 kg (evaluation unit only)
MaterialHousing evaluation unit: Polycarbonate RAL 7035, fire class B1 (UL 94 V0),
Process parts: Stainless steel 1.4571 (316 Ti)
Process connectionDN40 PN6 (system 1), tube ID = 43.1 mm, OD = 48.3 mm,
DN65 PN6 (system 2), tube ID = 70.3 mm, OD = 76.1 mm,
DN100 PN6 (system 3), tube ID = 107.1 mm, OD = 114.3 mm
Dimensions (HxWxD)System 1: 130 x 120 / 240 mm, other on request
System 2: 160 x 240…700 mm, other on request
System 3: 210 x 240…800 mm, other on request
MaterialStainless steel 1.4571 (316 Ti)
GFK (Durabest 180)
Electrical connections1x Mini-USB
1x DURAG device connector M23 (option)
Digital interfaces1x USB (service)
1x DURAG Modbus
1x Modbus RTU / RS-485 (optional extension module)
1x Profibus DP (optional DIN rail converter)
1x Modbus TCP (optional software module)
Analogue outputs1x 4...20 mA, 400 Ohm, isolated, assignment programmable
up to 17x with extension modules (option)
Analogue inputsNone (standard)
16x with extension modules (option) 0…20 mA, 50 Ohm, zero point programmable
Digital outputs3x relais output, contact NC/NO, permissible load 48 V, 0,5 A potential free, assignment programmable
up to 33x by extension modules (option)
Digital inputs1x digital input (standard), potencial free, assignment programmable
up to 33x by extension modules (option)
Power supply90...264 VAC, 48...62 Hz, 200 VA
Display, status LEDsGraphical LC display 120 x 92 mm,
5 LEDs for status display
Service software D‑ESI 100, including remote access via web-interface (option), requires PC with Windows XP® or Windows 7® OS
Remote access via USB / Modbus RTU (option) / Modbus TCP (option)
Ambient temperature (operational)-20 ... +50 °C (-4 ... 122 °F)
-40 ... +60 °C (-40 ... 140 °F) (option)
IP protection class (IEC 60529)IP65
Relative ambient humidity≤ 95% RF, non-condensing. Use weather protection hood for ≥ 95% RF
Altitude≤ 2000 m
EX zoneZone 2 (option)
Dimensions (hxwxd)220 x 335 x 145 mm
286 x 335 x 145 mm (incl. cable glands)
Weightapprox. 5 kg
MaterialStainless steel 1.4301, painted blue RAL 5017
  • Owing to the working principle, the accuracy of the measurement depends on the installation type and -location, the flow pattern and on the accuracy of the reference method.
  • Subject to technical modifications.



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