DPT-Flow S-4

DPT-Flow Series-4

Multifunctional air flow transmitters for
building automation systems

DPT-Flow Series-4 air flow transmitters are engineered for building automation in the HVAC/R industry. The most technologically advanced transmitters on the market, measuring volume flow, velocity, and static and differential pressure.

The DPT-Flow Series-4 devices can connect directly to the pressure measurement points in a centrifugal fan, providing accurate flow measurement of the fan. The smart user interface enables easy selection of configuration settings according to the
selected fan or in-duct measurement probe.

DPT-Flow Series-4 devices include:

  1. Two field selectable functions:
    1. Measure and monitor in-duct volume flow, velocity or
      differential pressure
    2. Measure and monitor air flow across centrifugal fans
  2. Multiple field selectable measurement units:
    1. Volume flow: m3/s, m3/h, CFM, l/s
    2. Velocity: m/s, FPM
    3. Pressure: inWC, mmWC, Pa, kPa, mbar
  3. Unique proportional output options:
    1. Volume flow or velocity: voltage (0–10 V) or current (4–20 mA)
    2. Pressure: voltage (0–10 V) or current (4–20 mA)

DPT-Flow Series-4 device options include:

• The function for true automatic zero point calibration, eliminating the need for periodic manual pushbutton autozero to ensure long term accuracy.
• NIST-calibration documentation

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DPT-Flow Series-4 devices are commonly used in HVAC/R
systems for:

• Air flow monitoring across centrifugal fans and blowers
• In-duct air flow monitoring
• VAV applications



Accuracy (at applied pressure):
Ranges < 0.5 inWC = ±0.01 inWC
Ranges  0.5 inWC = ±1.5 % inWC
(Accuracy specifications include: general accuracy, temperature drift, linearity, hysteresis, long term stability, and repetition error).
Thermal effects:
Temperature compensated across the full spectrum of capability.
Proof Pressure: 100 inWC
Zero point calibration:
Automatic with function or manual pushbutton autozero
Response time:
1.0−20 sec, selectable via menu

Technical Specifications

Media compatibility:
Dry air or non-aggressive gases
Pressure units (select via configuration menu):
Pa, kPa, mbar, inWC, mmWC
Pressure output range (select via configuration menu)

DPT-Flow-4 DPT-Flow-8 DPT-Flow-20 DPT-Flow-30
Pa 100-1,000 200-2,000 500-5,000 700-7,000
kPa 0.1-1.0 0.2-2.0 0.5-5.0 0.7-7.0
mbar 1-10 2.0-20 5.0-50 7.0-70
mmWC 10-100 20-200 50-500 70-700
inWc 0.4-4.0 0.8-8.0 2.0-20 2.5-30

Flow units (select via configuration menu):
Volume: m3/s, m3/hr, cfm, l/s
Velocity: m/s, fpm
Flow output range (select via configuration menu):

Units Range
m3/s 0.025-50
m3/hr 100-200,000
cfm 50-100,000
l/s 25-50,000
m/s 1-100
ft/min 200-20,000

Measuring element:
Operating temperature:
14−122 °F (-10−50 °C)
with (-eZ) circuit option
23−122 °F (-5−50 °C)
Configuration, while using display
32−122 °F (0−50 °C)
Storage Temperature:
-4−158 °F (-20−70 °C)
0 to 95 % rH, non condensing


Dimensions: 3.54” x 3.74” x 1.4”
(90.0 x 95.0 x 36.0 mm)
Weight: 5.3 oz (150 g)
2 each 11/64” (4.3 mm) screw holes, one slotted
Case: ABS (UL 94 V-0 Approved)
Lid: PC (UL 94 V-1 Approved)
Protection standard:
IP54 / NEMA3
Display (required for configuration):
2-line display (12 characters/line)
Size: 1.81” W x 0.57” H
(46.0 x 14.5 mm)
Electrical connections:
4-screw terminal block
Wire: 12–24 AWG (0.2–1.5 mm2)
Cable entry:
Strain relief: M16
Knockout ø: 0.625” (16 mm)
Pressure fittings:
3/16” ø (5.2 mm) barbed brass
+ High pressure
− Low pressure


Circuit: 3-wire ([V out or P out], 24 V, GND)
Input: 24 VAC or VDC, ±10 %
Output: 0–10 V, selectable via jumper
Power consumption: <1.0 W
Resistance minimum: 1 kΩ
Circuit: 3-wire ([V out or P out], 24 V, GND)
Input: 24 VAC or VDC, ±10 %
Output: 4–20 mA, selectable via jumper
Power consumption: <1.2 W
Maximum load: 500 Ω


Meets requirements for CE marking:
EMC Directive 2014/30/EU
RoHS Directive 2011/65/EU

Meets safety requirements for electrical equipment for measurement, control, and laboratory use:
ETL marking, standard IEC61010-1.

Product is tested and meets the NRTL product
approval requirements.

Model summary

DPT-Flow-4 DPT-Flow-8 DPT-Flow-20 DPT-Flow-30
Measurement ranges (inWC) 0–4 0–8 0–20 0–30
Description Model # Part # Model # Part # Model # Part # Model # Part #
Flow transmitter for measuring airflow in-duct and on centrifugal fans
– with display DPT-Flow-4-D
Series 4
10156 DPT-Flow-8-D
Series 4
10158 DPT-Flow-20-D
Series 4
10160 DPT-Flow-30-D
Series 4
– with and display DPT-Flow-4-eZ-D
Series 4
10157 DPT-Flow-8-eZ-D
Series 4
10159 DPT-Flow-20-eZ-D
Series 4
10161 DPT-Flow-30-eZ-D
Series 4