www.sensirion.com Version 6 – December 2016 4/7
3 Communication with the Sensor
The SLG flow meter shows bidirectional, linear
transfer characteristics. The product comes fully
calibrated for water.
Digital Sampling Time, 16 bit 74 ms
Digital Sampling Time, 9 bit 1 ms
3.1 Electrical Specifications
Table 2: DC Characteristics
3.2 Electrical Connector and Pinout
The flow meter is equipped with a male connector
type M8, 4-pin, threaded lock according to
IEC 61076-2-101 (Ed. 1)/ IEC 60947-5-2, and is
compatible with Sensirion’s SCC1 interface cables.
Table 3: Electrical pinout
3.3 Communication via USB cable
The Sensirion USB Sensor Cable provides an easy to
use USB Interface for laboratory and desktop use.
For further information please see the SCC1-USB
Sensor Cable datasheet, available on
www.sensirion.com/liquidflow-download.
3.4 Digital Communication via RS485-Bus
The SCC1-RS485 Sensor Cable for flow sensors
allows the communication via RS485 interface for use
in a demanding industrial automation environment. In
addition to the standard commands available in the
I²C interface of the sensor, the incorporated
microcontroller of the cable provides more complex
logic such as a dispense volume totalizer, automatic
dispense detection, automatic heater control and data
buffer for asynchronous read-out.
For further information please see the SCC1-RS485
Sensor Cable datasheet, available on
www.sensirion.com/liquidflow-download.
3.5 Analog Communication
The SCC1-ANALOG Sensor Cable allows simple and
quick readout of Sensirion’s liquid flow meters by
converting the digital sensor reading to a 0...10.5 V
analog voltage output. Additionally, a digital (high/low)
output with two different modes of operation is
available (Flow Switch / Volume Counter).
For further information please see the SCC1-Analog
Sensor Cable datasheet, available on
www.sensirion.com/liquidflow-download.
3.6 Digital Communication via I²C-Bus
Digital communication between a master and the SLI
sensor runs via the standard I²C-interface. The
physical interface consists of two bus lines, a data line
(SDA) and a clock line (SCL) which need to be
connected via pull-up resistors to the bus voltage of
the system.
These lines can be used on 3.3V or 5.0V level with a
clock frequency of 100 kHz. For the detailed
specifications of this I²C communication, please refer
to specific I²C Application Notes from Sensirion.
Table 4: I²C Output Characteristics
I
2
C Bus Clock Frequency
Output Voltage Low
(SDA/SCL), I
sink
= 6mA
Low Level Output Current
(SDA/SCL)
High Level Input Voltage
(SDA/SCL)
Low Level Input Voltage
(SDA/SCL)
