EM1NR SENSIRION, EM1NR Datasheet - Page 8

• Manufacturer Part Number: EM1NR
• Description: Flow Sensor
• Manufacturer: SENSIRION

Specifications of EM1NR

• Pressure Max: 116psi
• Accuracy: ± 3% At 1-100% Full Scale
• Flow Range: 0-20 Ln/min
• Sensing Accuracy: 3%
• Output Type: RS 232/SPI
• Supply Voltage Max: 18VDC
• Flow Rate Min: 0l/min
• Pressure Drop: 0.29psi
• Supply Voltage Min: 7VDC
• Sensor Output: RS-232/SPI
• Rohs Compliant: Yes
• Flow Rate Max: 20l/min
• Accuracy %: 3%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CMOSens
3
3.1 Device Configuration
The CMOSens
commands. They can only be sent through its RS232
interface (see Table 6 for valid commands; for correct
settings of the RS232 refer to Section 2.1). This allows
the user to configure the CMOSens
Since the configuration is stored in the internal
EEPROM, it is maintained after power interruptions.
Table 6: RS232 Interface commands
Important Notes:
• The commands are not case sensitive.
• In order to send a new command to the EM1 Mass Flow Meter make sure the EM1 is not in measurement mode. Issue therefore
• The EEPROM on the EM1 has limited write cycles allowed on a memory cell (as true for every EEPROM). The EEPROM on the
www.sensirion.com
Command
help↵
ver↵
info↵
data↵
go↵
s
get↵
mod=F | T↵
res=0..7↵
int=x↵
updatetemp↵
rdatax↵
wdatax=yyyy↵
test↵
reset↵
a stop command s first. After this, any instruction can be given to the EM1 Mass Flow Meter and a new series of measurement
can be started by go↵.
EM1 is specified for a minimum of 1 mio. write cycles on a single memory cell. Some commands rewrite EM1 registers in the
EEPROM. These commands are marked in the column ‘EEPROM Write Access’. Therefore excessive use of one of these
commands e.g. for reconfiguration should be avoided. E.g. using the GET command every 5 seconds would reduce the
guaranteed life time of the EEPROM to 10e7 / (60/5*60*24) = 60 days.
Configuration and Commands
®
EM1 Mass Flow Meter for Gases
®
EM1 device accepts a set of
Output
commands
version
calibration
serial ID
stop
mode
resolution
Description
Lists all available commands
Provides type of sensor, software, hardware and customer version
Unit / Factor Flow / Overflow / Sensitivity / Factor Temperature
Sensor Serial Number
Starts series of measurements
Stops series of measurements
Start single measurement
Selects Flow- (F) or Temperature mode (T), (mod? = Status)
Sets resolution: 0 -> 8 bits; 7 -> 15 bits, see Table 7, (res? = Status)
Interval between automatic internal temperature measurements for an
INT = 12000 therefore is an update every 60 sec. The duration of an
Attention : Flow is not measured during this internal temperature
(INT? = Status).
Manual command for an internal temperature measurement for internal
temperature compensation. Used with int=0
reads 4 user defined bytes at the address x={0,…,9}
writes a maximum of 4 user defined bytes at the address x={0,…,9}
Sensor Selftest
Resets CMOSens
internal update of the temperature compensation. 0=never, {1..2*10
INT is measured in units of 5 ms.
update is 45 ms.
update!
update of the
®
EM1 device.
Data Sheet EM1 – v3.0 /March 2009
®
EM1 device
With the exception of the stop s command, all
commands have to be sent in the ASCII-format and
terminated by the return key (↵, ASCII #10 or
#13). After completion of a command, the CMOSens
MFM returns ok and is ready to take a new instruction.
Before entering a command, it may be necessary to
clear the buffer by means of using ↵.
9
}.
EEPROM
Write
Access
YES
YES
YES
YES
YES
YES
YES
YES
YES
8 / 14
®