SITRANS FST020

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SITRANS FST020 is a basic clamp-on transmitter for liquid flow applications where temperature, viscosity, or high accuracy are not critical. It offers a cost-effective solution for standard flow measurement needs.

Zalo Hotline: 0961.67.69.69

Categories: Flow, Transmitter, Ultrasonic Tags: Bộ chuyển đổi tín hiệu, Công nghiệp chế biến, Công nghiệp HVAC, Xử lý nước, Xử lý nước thải Brand: Siemens

Description
Specifications

Overview

The SITRANS FST020 is a basic clamp-on signal converter designed for liquid flow measurement applications that do not require temperature or viscosity data, nor extremely high accuracy. It employs Digital Signal Processing (DSP) technology to deliver stable measurement, fast response, and user-friendly operation.

Key Features

Measures essential parameters: volumetric flow, flow velocity, ultrasonic transit time, and totalized flow
Data update rate: 100 Hz, with a maximum signal delay of 20 ms
Independent low flow cut-off thresholds for both flow and velocity
240×160 pixel graphical display, supporting up to 6 configurable screen layouts
Standard communication via Modbus RTU (RS-485), with 4–20 mA analog output and alarm relay
SensorFlash technology stores configuration, calibration certificates, operational data, and alarm logs
Compatible with Siemens PDM software (version 8.2 SP1 and later)
Non-intrusive clamp-on installation, single-path configuration
IP65 wall-mounted housing, made of lightweight polycarbonate
Flexible power supply: 100–240 V AC or 11.5–28.5 V DC
Supports bidirectional flow measurement

Technical Configuration

Clamp-on (non-intrusive) installation—no pipe cutting required
Single-path design—uses one pair of transducers per pipe
Wall-mounted enclosure, IP65 / NEMA 4X rated, made of polycarbonate
Power supply options: 100–240 V AC or 11.5–28.5 V DC
User interface available in English and German
Integration with SIMATIC PDM software from version 8.2 SP1 onward

Application Areas

SITRANS FST020 is ideal for water and general-purpose liquid flow applications in:

Water and wastewater utilities
HVAC systems (hot water, chilled water, condensate)
Basic industrial process flow monitoring
Periodic flow verification of existing systems

Summary of Benefits

Cost-effective solution for applications with moderate accuracy requirements
No pipe cutting, no pressure drop
Easy installation, low maintenance
Intuitive display, fast configuration
Delivers all essential flow measurement features in a compact and efficient design

Category	Specification
Input
Flow range	±12 m/s (±40 ft/s), depending on pipe size (higher or lower)
Flow direction	Bi-directional
Flow sensitivity	0.0003 m/s (0.001 ft/s), flow rate independent
Digital inputs
Totalizer Hold	Optically isolated diode Activated ON: Input voltage 2 … 10 V DC
Totalizer Reset	Optically isolated diode Activated ON: Input voltage 2 … 10 V DC
Output
Current	4 … 20 mA (isolated), externally powered 10 … 30 V DC
Passive	30 V DC, 3 VA AC max
Pulse	Optically isolated transistor 10 mA, 30 V DC max Relay: 41.6 ms … 5 s pulse duration Frequency: 0 … 12.5 kHz (50% duty cycle)
Accuracy
Accuracy	±1.0% of flow for velocities above 0.3 m/s (1 ft/s)
Repeatability	±0.25% (according to ISO 11631)
Zero drift	0.1% of rate; <±0.001 m/s (<±0.003 ft/s)
Data refresh rate	100 Hz
Rated operating conditions
Operating temperature	-10 … +50 °C (14 … +122 °F)
Storage temperature	-20 … +60 °C (–4 … +140 °F)
Degree of protection	IP65 / NEMA 4X
Design
Weight	1.4 kg (3.0 lbs)
Dimensions (W × H × D)	176 × 240 × 87 mm (6.9 × 9.5 × 3.4 in)
Enclosure material	Polycarbonate
Power supply
Voltage range	100 … 240 V AC @ 20 VA 11.5 … 28.5 V DC @ 10 W
Certificates and approvals
Unclassified locations	Not specified
General safety	UL, cUL, CE