TSI Incorporated 4140, Руководство по эксплуатации и обслуживанию

Страница: 15 / 26

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 Model 4140/4143 Flowmeter measures mass flow rate,
temperature and absolute pressure of the gas inside the flow tube. All
measurements made by the Models 4140/4143 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 .
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 Model 4140/4143 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
20 Std L/min. The analog output scaling is user selectable. Refer to
the
Series 4000/4100 RS232 Serial Command Set manual for
instructions on how to obtain flow data through the serial port.
Gas calibrations (air, 100% O
2
, 100% N
2
or 100% N
2
O) can be
selected through the RS232 serial port. Refer to the Series
4000/4100 RS232 Serial Command Set manual. The LCD display
will indicate the calibration being utilized: air, O
2
, N
2
, or N
2
O.
Flow can be displayed in units of standard liters per minute
(Std L/min
*
) or in volumetric units of liters per minute (L/min). Refer to
Appendix B for a description of the two measurements. Selecting
between the two measurements is accomplished through the serial
*
TSI instruments defines standard conditions as 21.1°C (70° F) and 101.3 kPa (14.7
psia, 1 bar).