EM1NV SENSIRION, EM1NV Datasheet - Page 9

• Manufacturer Part Number: EM1NV
• Description: Flow Sensor
• Manufacturer: SENSIRION

Specifications of EM1NV

• Pressure Max: 116psi
• Accuracy: ± 3% At 1-100% Full Scale
• Flow Range: 0-200 Ln/min
• Sensing Accuracy: 5%
• Output Type: RS 232/SPI
• Supply Voltage Max: 18VDC
• Flow Rate Min: 0l/min
• Pressure Drop: 0.029psi
• Supply Voltage Min: 7VDC
• Sensor Output: RS-232/SPI
• Rohs Compliant: Yes
• Flow Rate Max: 200l/min
• Accuracy %: 3%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CMOSens
3.2 Measurement frequency vs. resolution
There is a trade-off between resolution and
measurement time. Possible settings are listed in Table
7. Choosing 12 bit results in a measurement interval of
80 ms. With the max resolution of 15 bit, a new
measurement is provided every 640 ms.
Table 7: Resolution settings using the res=value
command and corresponding response times
res=
0
1
2
3
4
5
6
7
Table 8: Error Codes
www.sensirion.com
Error Code
ERROR 01
ERROR 02
ERROR 03
ERROR 04
ERROR 05
ERROR 06
ERROR 50
ERROR 99
®
EM1 Mass Flow Meter for Gases
Resolution
[bit]
10
11
12
13
14
15
8
9
Description
Invalid command
Wrong syntax
Value out of range
Not allowed mode
No permission
No permission
Invalid EEPROM
Internal error
integration
time [ms]
Internal
signal
160
320
640
10
20
40
80
5
Data rate
Data Sheet EM1 – v3.0 /March 2009
3.125
[Hz]
12.5
6.25
1.56
200
100
50
25
3.3 Measurement Strategy
As mentioned in paragraph 3.1 (Important Notes)
excessive EEPROM write cycles should be avoided.
Sensirion therefore recommends to use the EM1 in
PUSH-mode strategy: The EM1 is set to constant
measurement
measurement once it becomes available. Check Table
7 for the update rate (data rate).
When using the EM1 in GET-mode strategy a
measurement is started after the GET command only.
At each GET command the same EEPROM memory
cells are rewritten.
mode
Notes
and
is
pushing
a
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