TRZUltrasonic Flow Meters for Air
(Diameters 100A, 150A and 200A)

TRZ Photo


A cost effective ultrasonic flow meter specialized for measuring air is now available!
It has realized a wide range of measuring ability and ZERO pressure loss using the characteristics of ultrasonic waves. It is also well-equipped to handle dust and mist and has excellent durability compared with conventional flow meters that use other measuring principles because it does not have moving parts.
The meter can be selected from two types of power sources: built-in batteries that run 10 years without needing power construction, or an external power supply (24 VDC).

・To understand and visualize the usage of compressed air as a measure of saving electric power.


Model External power specifications TRZ100D-C/4P TRZ150D-C/4P TRZ200D-C/4P
Built-in battery specifications TRZ100-C/4P TRZ150-C/4P TRZ200-C/4P
Diameter (Nominal diameter) 100A 150A 200A
Power source External power specifications 32-18. 24 VDC ± 10%; Power consumption: 1.1 W or less
Built-in battery specifications Lithium battery with a battery life about 10 years (under an environmental temperature of 20°C)
Measurable Fluids Air (mainly the air in a factory)
Fluid temperature and humidity - 10 to 60°C, 90% RH or less
Operating pressure Less than 0 to 1 MPa (Gauge pressure)
Flow rate range (Actual flow) ±10~500m3/h ±24~1200m3/h ±40~2000m3/h
Flow measurement accuracy ±2%RS ±50~500m3/h ±120~1200m3/h ±200~2000m3/h
±5%RS ±10~50m3/h ±24~120m3/h ±40~200m3/h
Low flow rate cut-off ±2.6m3/h ±5.0m3/h ±9.0m3/h
Normal conversion accuracy ± 2% (300 kPa or more)
Display (Switched by buttons) Model LCD 7 segments (with unit and alarm displays)
Main display [Forward flow display mode]
Accumulated flow rate: 0000000000 (Nm3/h) in 10 digits
Trip accumulated flow rate: 000000000 (Nm3/h) in 9 digits
Instantaneous flow rate: 0000000 (NL/min) in 7 digits [200A: × 10]
[Forward and reverse flow display mode]
Forward accumulated flow rate: 0000000000 (Nm3/h) in 10 digits
Reverse accumulated flow rate: -000000000 (Nm3/h) in 9 digits
Instantaneous flow rate: 0000000 (NL/min) in 7 digits [200A: × 10]
Sub display Instantaneous flow rate:
000.00 (Nm3/h, less than 200 Nm3/h) in 5 digits
0000.0 (Nm3/h, 200 Nm3/h or more and less than 2000 Nm3/h) in 4 and 1/2 digits
00000 (Nm3/h, 2000 Nm3/h or more) in 5 digits [200 A × 10]
Pressure: 0000.0 kPa in 5 digits
Temperature: 00.0°C in 3 digits
Output Current output 4 to 20 mA (± 0.5% FS), Load resistance 400 Ω or less, Upper output current 22 mA
Select the output from the instantaneous flow rate, pressure and temperature by pressing a button.A separate power supply (24 VDC ± 10%) is necessary if you use the meter of the built-in battery specifications. *1
Output range (4 to 20 mA): Instantaneous flow rate
0 to ☐☐☐☐ Nm3/h (forward flow display mode)
– ☐☐☐☐ to ☐☐☐☐ Nm3/h (Forward and reverse flow display mode)
☐☐☐☐ is the values set by a button.
Pressure: 0 to 1000 kPa
Temperature: -10 to 60°C
Contact output Two open-drain output system
Maximum load: 24 VDC, 10 mA
Maximum frequency: 10 Hz
Duty: 35% to 65%
Output 1: Unit pulse (Forward flow)
Output 2: Unit pulse (Reverse flow)
Flow rate upper and lower limits alarm
Selection of telegram output
Pulse output units: 1 Nm3/P or 10 Nm3/P
Connection method JIS 10K flange
Mounting position Horizontal (LCD display to be placed upward), or vertical mounting
The materials exposed to gases Stainless steel alloy, PPS, fluorosilicone rubber, etc.
Mass External power specifications 10.3kg 18.3kg 24.4kg
Built-in battery specifications 10.5kg 18.5kg 24.6kg
Installation location Indoor and outdoor (The safety class IP64 qualified)
Storage temperature -20 to 70°C, No condensing
Regulatory compliance CE marking compliant (EN 61000- 6-2:2005 and EN 61000- 6-4: 2007)

*1:In the actual flow measurement setting, the digits of the accumulated flow rate display, instantaneous flow rate display and pulse output vary.
*2: When displaying the instantaneous flow (NL /min), the main display (accumulated flow rate), sub-display (instantaneous flow rate [Nm3/h]), pressure (kPa) and temperature (°C) will not be displayed.
* Piping conditions:
20D or higher in upstream and 5D or higher in downstream for the 25A/32A models. (When using in the forward and reverse display mode, 20D or higher on both sides.)
10D or higher in upstream and 5D or higher in downstream for the 40A or larger models. (When using in the forward and reverse display mode, 10D or higher on both sides.)
For more information, please contact our sales and branch offices.

Conversion chart between actual and normal flow rates

Conversion conditions 100A 150A 200A
Temperature (°C) Gauge pressure (MPa) Minimum Maximum Minimum Maximum Minimum Maximum
Actual flow rate (m3/h) 10 500 24 1200 40 2000
20 0.7(Nm3/h) 74 3680 180 8840 290 14700
30 0.5(Nm3/h) 53 2670 130 5420 210 10700
0.7(Nm3/h) 71 3550 170 8550 290 14250


(Unit: mm)

Model W H φ D Mass
TRZ100-O 250 280 210 10.5 kg (1. Built-in lithium battery model)
10.3 kg (2 External power supply model)
TRZ150-O 300 341 280 18.5 kg (1. Built-in lithium battery model)
18.3 kg (2 External power supply model)
TRZ200-O 350 391 330 24.6 kg (1. Built-in lithium battery model)
24.4 kg (2 External power supply model)