Thermal flow meter for compressed air and process gases

Flowgas TMS 500

Thermal flow meter for compressed air and gases, measuring flow, consumption and velocity in pipes up to DN 300. It supports 4–20 mA, RS 485 Modbus RTU and pulse outputs, with optional display and G 1/2 insertion mounting.

Introduction

Compressed air and process gas costs become easier to control when consumption is measured directly at machines, systems or nitrogen generators. This insertion sensor records flow, consumption and velocity for air and gases such as nitrogen, oxygen, CO2, argon and nitrous oxide, helping users identify leakage air, check usage and build a clearer compressed air balance.
 
The calorimetric measuring principle uses the cooling of a heated sensor as the measuring effect, so no additional pressure or temperature compensation is required. Installation is practical on site: the sensor mounts through a standard G 1/2 ball valve, can be installed under pressure and uses an engraved depth scale for positioning in the pipe center.
 
For integration into industrial systems, the device offers 4–20 mA, RS 485 Modbus RTU and pulse output options. Versions cover pipes up to DN 300, operating pressure up to 50 bar and air velocities up to 224 m/s, with stainless steel wetted parts for demanding gas applications.

Install under pressure
Install under pressure
G 1/2 ball valve mounting allows insertion without depressurizing the line.
Low pressure loss
Low pressure loss
The calorimetric sensor measures without moving parts and creates negligible pressure loss.
Broad gas coverage
Broad gas coverage
Use one sensor family for air, nitrogen, oxygen, CO2, argon and nitrous oxide.
Industrial outputs
Industrial outputs
Connect via 4–20 mA, pulse output or RS 485 Modbus RTU for automation systems.
Clear on-site values
Clear on-site values
The optional 1.8" TFT shows current consumption and total consumption directly.
High-speed option
High-speed option
Versions cover up to 92.7 m/s, 185 m/s or 224 m/s, depending on version.

Features

Calorimetric measurement

A heated sensor is cooled by the surrounding gas flow. The device uses this cooling as the measuring effect and records flow, consumption and velocity without additional pressure or temperature compensation.

Selectable units

Units are selectable by keys, including m³/h, m³/min, l/min, l/s, ft/min, cfm, m/s, kg/h, kg/min and kg/s.

Consumption counter

The counter records total consumption up to 1,999,999,999 m³ and can be reset to zero from the keypad.

Configurable pipe diameter

The inner diameter is set with the keypad, and an engraved depth scale supports positioning the sensor in the pipe center.

Reference conditions

Factory setting follows DIN 1945 and ISO 1217 at 20 °C and 1000 mbar; other standard conditions can be set by keypad or service software.

Probe lengths

Probe lengths from 120 mm to 700 mm are available for different pipe dimensions.