Sensidyne Gilian Gilibrator STABLFLOW, Руководство по эксплуатации, Страница: 22 / 46

© 2018 Sensidyne, LP Sensidyne Document No. 360-0213-01 - Rev B
Page 16
Gilian Gilibrator 3 ® Dry Cell Calibrator – Operation Manual
SECTION FOUR: General Operation
4.1. Overview
The Gilibrator 3 Dry Cell Calibration System has the capability of reading and recording
flow over the range of 5 cc/min to 30,000 cc/min (30 LPM) by use of three Dry Flow
Cells (Low ranges: 5-450 cc/min, Standard: 50 – 5000 cc/min, and High: 1-30 LPM),
that are selected based on the desired flow rate of the sampling source. The Gilibrator
3 contains a STP sensor that measures the ambient temperature and pressure and
can correct sample flows to Standard conditions. Standard temperature and pressure
can be set to desired values.
The calibrator may be set up to run in continuous mode or averaging mode. In
averaging mode, the user may select the number of samples to be averaged, ranging
from a 3 – 20 sample count. While averaging, the calibrator will provide a percent 2-
sigma (95% confidence level) number that is 2*standard deviation/average*100% and
lets the user evaluate the stability of the flow measurement in real-time. The user may
select from a range between 0.5 – 5% for the threshold, so that the number is displayed
GREEN if below, and RED if above.
When the base is powered down or when flow cells are disconnected, all air paths are
bridged to allow free-flow of air from the inlet to the outlet and the puck is allowed to
drop to the bottom of the cell. Once the base is powered-up, a cell is attached, and a
flow source is present, the system will begin cycling and tuning the back-pressure that
the pump sees. This process may take several cycles, depending on the flow
conditions. Gravity affects the backpressure compensation and therefore the unit
should be kept stable while making measurements. The cell calibration offset is also
affected by gravity and therefore the unit should be kept within 5 degrees of vertical for
measurements in the low range of the dry cells.
WHEN THE FLOW SOURCE IS STOPPED OR DISCONNECTED, IT IS IMPORTANT
TO MOMENTARILY PRESS THE “CELL RELEASE BUTTON” TO RESET THE FLOW
CONTROL ELEMENTS IN THE BASE BEFORE THE FLOW IS RESTARTED.
The flow measurement will always be displayed on the LCD for the user to make pump
adjustments. Once the flow is stable, the user can press the “START” button to begin
sampling data for the report and/or transmit data on the DB9 port. In AVERAGING
mode, once all samples are collected, the SAVE button will be enabled to allow the
user to save the report to internal memory. Reports can be exported from internal
memory to an SD card in bitmap format for easy printing and CSV for importing in a
spreadsheet application.