EM1-H0R0V-1N SENSIRION, EM1-H0R0V-1N Datasheet - Page 7

• Manufacturer Part Number: EM1-H0R0V-1N
• Description: MASS FLOW METER, FOR GASES
• Manufacturer: SENSIRION

Specifications of EM1-H0R0V-1N

• Svhc: No SVHC (15-Dec-2010)
• Air Flow Range: 0 - 0.05 L/min
• External Length / Height: 104mm
• External Width: 33.7mm
• Height: 43.6mm
• Length (imperial): 5.35"
• Output Configuration: RS232/SPI
• Output Type: RS232
• Pressure Max: 8bar
• Supply Voltage Range Dc: 7V To 18V
• Supply Voltage Dc Max: 18VDC
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CMOSens
For the above reasons, Sensirion guarantees the safe
use of the CMOSens
in-explosive and non-toxic gases only.
2
Figure 5: CMOSens
2.1 Electrical Connector
The electrical connector on the cover of the CMOSens
EM1 is a Molex PN 53014-0810 (straight header, male,
8Pin). You need a Molex PN 51004-0800 connector
housing (female, 8 Pin) with crimp contacts Molex PN
50011-8100 to connect the sensor. Please check the
Molex homepage for details (http://www.molex.com).
2.2 Power supply
The CMOSens
voltage supply between 7V and 18 V. Since this voltage
is internally regulated, there are no stringent
requirements as far as ripple and stability are
concerned.
2.3 Digital Interface
The CMOSens
interfaces: One is a bi-directional RS232 to set
configuration and to get flow or temperature values.
The other one is a uni-directional SPI that only sends
flow or temperature depending on the configuration
which was made by RS232.
2.4 Dataformat and Interpretation
The received value is a 16 bit signed integer in the
two's complement representation. The calibrated data
is multiplied by a constant factor and then rounded to
the next smaller integer in order to transfer also
fractions of an unit through the integer protocol.
Product
EM1NH
EM1NL
EM1NR
EM1NV
www.sensirion.com
Pins and Electrical Interfaces
®
Flow scale factor
EM1 Mass Flow Meter for Gases
®
®
EM1 Mass Flow Meter requires a
EM1 Mass Flow Meter has two
1/100
1/128
1/50
®
1
®
EM1 pin out.
EM1 Mass Flow Meter for inert,
Temp. scale factor
0.01
0.01
0.01
0.01
Data Sheet EM1 - v 2.6 / October 2006
®
Example for EM1NV: a received value of +1234 (dec)
corresponds either to 9.641 ln/min in flow mode or
12.34 °C in temperature mode. An explanation of the
overflow modes can be found in section 1.1.
*not possible value, just to show the principle
Figure 6: Interpretation of Integer values
2.5 RS232 Interface
All configurations (see also Section 3) for the
CMOSens
The following pins are required to communicate with the
CMOSens
RxD
TxD
GND
The RS232 protocol of the CMOSens
configured as follows:
Baudrate
Data Bits
Stop Bits
Parity
Protocol
Echo
With these settings, the CMOSens
connected to any PC or device with an RS232
interface. The commands have to be sent in ASCII
format, the measurement values are provided as a 16
bit signed integer in binary format with 2 bytes
synchronization preceding.
value (hex)
received
0xFFFF
0x87B0
0x7852
0x7851
0x7850
0x0001
0x0000
(Receiving Data Line)
(Transmitting Data Line)
(Ground)
®
®
MFM via RS232:
EM1 can be set using its RS232 interface.
value (dec)
received
-30800
19200
8
1
none
none
the sensor generates an echo
30802
30801 peak overflow
30800
-1
1
0
overflow
[ln/min ]
+0.007813
-0.007813
+240.600
0.000000
flow
-240.600
®
EM1 device can be
temperature
®
[°C]
+308.00*
-308.00*
--
--
MFM is
-0.01
0.01
0.00
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