7
Chapter 3
Operation
Caution
TSI flowmeters are not medical devices under
FDA 510k and in no situation should they be
utilized for human respiration measurements.
Overview
The Models 4040/4043/4045 Flowmeters measure mass flow rate,
temperature and absolute pressure of the gas inside the flow tube. All
measurements made by the Model 4040/4043/4045 are NIST
traceable.
ON/OFF Switch
Slide the switch to the ON position. The power switch is marked in the
international symbols '
|
' for
on
and 'O' for
off
. The flowmeter will begin
to simultaneously display flow rate, temperature and pressure.
Warm-up Time
The flowmeter will provide readings immediately upon power-up.
Recommended warm-up time of the flowmeter is 5 minutes.
Flow Rate Measurement
Flow rate data can be obtained from the Models 4040/4043/4045
through the LCD display, RS232 serial port or the linearized analog
output. The analog output is a 0 to 10 volt DC linear signal
representing 0 to 300 Std L/min (Model 4043: 200 Std. L/min) (analog
output scaling is user selectable). Refer to the RS232 Serial
Command Set manual for instructions on how to obtain flow data
through the serial port.
Gas calibrations (air, 100% nitrogen, 100% oxygen, or air/oxygen
mixtures) can be selected through the RS232 serial port. Refer to the
RS232 Serial Command Set manual for instructions on how to select
gas calibrations. The LCD display will indicate the calibration being
utilized, air or O
2
. When air/oxygen mixtures are being measured, the
LCD display will illuminate both the air and oxygen symbols. When
nitrogen is selected no gas type is displayed on the LCD.
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