Agilent Technologies G6691A Bedienungsanleitung

Agilent Technologies

Agilent G6691A

ADM Flow Meter

Operating

Instructions

Notices

No part of this manual may be reproduced in any form or

by any means (including electronic storage and retrieval

or translation into a foreign language) without prior

agreement and written consent from Agilent Technolo-

gies, Inc. as governed by United States and international

Manual Part Number

G6691-90000

Edition

First edition, October 2016

Printed in USA

Agilent Technologies, Inc.

2850 Centerville Road

Wilmington, DE 19808-1610 USA

Warranty

The material contained in this document is provided “as

is,” and is subject to being changed, without notice, in

future editions. Further, to the maximum extent

permitted by applicable law, Agilent disclaims all

warranties, either express or implied, with regard to

this manual and any information contained herein,

including but not limited to the implied warranties of

merchantability and fitness for a particular purpose.

Agilent shall not be liable for errors or for incidental or

consequential damages in connection with the furnish-

ing, use, or performance of this document or of any

information contained herein. Should Agilent and the

user have a separate written agreement with warranty

terms covering the material in this document that con-

flict with these terms, the warranty terms in the sepa-

rate agreement shall control.

Technology Licenses

The hardware and/or software described in this docu-

ment are furnished under a license and may be used or

copied only in accordance with the terms of such license.

Safety Notices

CAUTION

A CAUTION notice denotes a hazard. It calls

attention to an operating procedure, practice,

or the like that, if not correctly performed or

adhered to, could result in damage to the

product or loss of important data. Do not pro-

ceed beyond a CAUTION notice until the indi-

cated conditions are fully understood and

met.

WARNING

A WARNING notice denotes a hazard. It

calls attention to an operating procedure,

practice, or the like that, if not correctly

performed or adhered to, could result in

personal injury or death. Do not proceed

beyond a WARNING notice until the

indicated conditions are fully understood

and met.

Agilent Technologies

Introduction 4

Principles of Operation 6

Display 7

Using the Flow Meter Stand 8

Power/Mode Button 9

Select Button 9

Switching the ADM Flow Meter On and Off 9

Operating Modes 10

Making a Flow Measurement 12

Storing Flow Measurements 13

Reading and Setting a Split Ratio 15

About Flow Measurements 16

Info Mode 17

USB Interface 21

Warning and Error Indications 23

Replacing the Cartridge 24

Replacing Batteries 27

Upgrading the Firmware/Retrieving Certificate of

Calibration 30

A Note About Back Pressure 30

Technical Support 30

Product Specifications 31

4 Agilent ADM Flow Meter Operating Instructions

Introduction

Congratulations on your purchase of the new Agilent ADM Flow Meter! The ADM

Flow Meter has been designed to accurately measure the flow of gases commonly

used in Gas Chromatography without knowledge of the gas type or mixture compo-

sition. A complete ADM Flow Meter consists of a Flow Meter Mainframe and a

Flow Meter Cartridge. The Flow Meter Mainframe contains the display, keypad,

batteries, and microprocessor; while the Flow Meter Cartridge contains all of the

hardware used to make a flow measurement. Flow Meter Cartridges are individu-

ally factory calibrated and can easily be replaced with a new cartridge without

returning the Flow Meter to Agilent. This eliminates the hassle and downtime

associated with maintaining the calibration of an instrument that would normally

need to be sent to an outside facility for calibration on a yearly basis.

Agilent ADM Flow Meter Operating Instructions 5

Included in the packaging are the following items:

Table 1 Packing List

1 ADM Flow Meter Mainframe

1 ADM Flow Meter Cartridge

1 USB Cable

1 Screwdriver, Phillips head

3 AA Alkaline Batteries

1 Calibration Certificate

1 Declaration of Conformance

1 Quick Start Guide

6 Agilent ADM Flow Meter Operating Instructions

Principles of Operation

The ADM Flow Meter provides continuous, real time measurements of dry gas

flows, such as those used for Gas Chromatography. Unlike bubble flow meters, the

ADM Flow Meter operates without liquids, bubbles, or glass parts. When acti-

vated, a solenoid actuated valve interrupts the gas flow momentarily. The gas flow

moves a diaphragm in proportion to the flow rate. This movement is transformed by

the Flow Meter's electronics into a digital value which is displayed on the Flow

Meter's screen. The ADM Flow Meter provides two different types of flow mea-

surements: volumetric flow (mL/min) and mass flow reported in standard cubic

centimeters per minute (sccm). Mass flow values are calculated from the volumet-

ric measurements by correcting for ambient temperature and atmospheric pres-

sure, and reporting the flow rate referenced to 0 °C and 1 atmosphere of pressure,

using digital temperature and pressure sensors installed in the mainframe of the

flow meter.

The ADM Flow Meter employs a replaceable cartridge that contains all parts sub-

ject to calibration. This eliminates the need to ship the entire meter back to the fac-

tory to maintain its calibration. The cartridge calibration is valid for a period of one

year from its first use. A new, calibrated cartridge can be ordered in advance, and

then installed when necessary.

When the flow meter is powered on with a new cartridge installed, the current date

is written to the cartridge’s memory based on the mainframe’s internal clock. Each

time the flow meter is turned on, the meter will compare the current date to the ini-

tial turn on date of the cartridge. If the initial turn on date is more than a year from

the current date, the flow meter will flash a notification to the user that the calibra-

tion has expired. The flow meter will still function with an expired calibration. This

eliminates downtime, enabling you to keep working. See “Replacing the

Cartridge" on page 24.

CAUTION The measurement calibration can be affected if the instrument

is exposed to temperatures above 50 °C for extended periods

of time.

Please inspect the temperature label attached to the inside of

cartridge packaging to verify that your cartridge has not been

damaged in shipment. A grey circle is acceptable, a black circle

indicates that the cartridge may have been exposed to an

extreme temperature.

Please contact Agilent Technical Support if your cartridge is

delivered with a temperature indicator that is black.

Agilent ADM Flow Meter Operating Instructions 7

The ADM Flow Meter is powered by three AA alkaline batteries. Power can also be

supplied via the micro USB port located on the side of the unit.

Display

The ADM Flow Meter has a bright OLED display with a battery strength indicator.

The unit automatically adjusts the resolution of the display in response to various

gas flow ranges as follows:

When the battery strength indicator shows that the battery strength is low, replace

the batteries. See “Replacing Batteries" on page 27.

NOTE Using the USB port to supply power does not recharge the

installed batteries.

NOTE The ADM Flow Meter can also be powered by rechargeable batter-

ies, but the battery indicator may not display correctly.

Flow (mL/min)

Display resolution

(mL/min)

0 - 9.99 0.01

10.0 - 99.9 0.1

100 - 750 1.0

8 Agilent ADM Flow Meter Operating Instructions

Using the Flow Meter Stand

The flip down wire stand will give you a better viewing angle when the ADM Flow

Meter is placed above bench level. Pull the stand down until it is in the locked posi-

tion.

Stand

Agilent ADM Flow Meter Operating Instructions 9

Power/Mode Button

The Power/Mode button is used to switch the ADM Flow Meter on and off, as well

as to scroll through and select the different operational modes.

•To turn on the instrument briefly press and release the Power/Mode button.

•To turn off the instrument press and hold the Power/Mode button for three sec-

onds.

•To scroll through the available modes, when the instrument is on, briefly press

and release the Power/Mode button.

Select Button

The Select button is used to access additional functionality within the operating

modes. This includes storing flow measurements, setting a reference value for the

Split Mode, and changing the settings.

Switching the ADM Flow Meter On and Off

With the ADM Flow Meter powered off, briefly press and release the Power/Mode

button to turn the unit on. The display will flash the Agilent logo for approximately

3 seconds, and then begin operating. During startup, the microprocessor will run a

self-diagnostic test to ensure the unit is functioning properly.

With the unit powered on, press and hold the Power/Mode button for three sec-

onds to power down the unit.

10 Agilent ADM Flow Meter Operating Instructions

Operating Modes

With the ADM Flow Meter switched on, briefly press the Power/Mode button to

scroll through the different operational modes.

The available modes are as follows:

Volumetric flow mode

This is the default mode on power up. In this mode, the volumetric flow rate is dis-

played in mL/min.

Mass flow mode

In this mode, the volumetric flow rate is corrected taking into account the current

atmospheric pressure and ambient temperature. The flow rate is displayed in sccm

(standard cubic centimeters per minute) referenced to 1 atmosphere of pressure

and 0 °C.

Split mode

In this mode, you can store a flow measurement as a reference value, and then

compare subsequent flow measurement values as a ratio of the current measure-

ment to the reference measurement. This is useful when trouble shooting a GC

Inlet.

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