Agilent Technologies ADM1000 Manual de usuario

Agilent

Flowmeter

ADM1000

Operating

Instructions

Notices

No part of this manual may be reproduced

in any form or by any means (including

electronic storage and retrieval or transla-

tion into a foreign language) without prior

agreement and written consent from

Agilent Technologies, Inc. as governed by

United States and international copyright

laws.

Manual Part Number

I-0007

Edition

Third edition, June 2003

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 dis-

claims all warranties, either express or

implied, with regard to this manual and

any information contained herein, includ-

ing but not limited to the implied warran-

ties of merchantability and fitness for a

particular purpose. Agilent shall not be

liable for errors or for incidental or con-

sequential damages in connection with

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herein. Should Agilent and the user have

a separate written agreement with war-

ranty terms covering the material in this

document that conflict with these terms,

the warranty terms in the separate agree-

ment shall control.

Technology Licenses

The hardware and/or software described

in this document are furnished under a

license and may be used or copied only in

accordance with the terms of such license.

CAUTIONCAUTION A CAUTION notice denotes a hazard. It calls attention to an operating proce-

dure, 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 proceed

beyond a CAUTION notice until the indicated 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.

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Agilent Flowmeter ADM1000

Operating Instructions

Agilent Flowmeter

ADM1000

Packing List

Thank you for choosing Agilent's ADM1000 Flowmeter. When

unpacking the box, please make sure it contains the following:

Principle of Operation

The ADM1000 provides continuous, real time measurements

ofallNON-CORROSIVE AND NONFLAMMABLE GAS FLOWS.

Unlike bubble flowmeters, the ADM1000 operates without liq-

uids, bubbles or glass parts.

When activated, a solenoid actuated valve interrupts the gas

flow momentarily. The gas flow moves a diaphragm in propor-

tion to the flow rate. This movement is transformed by the

microprocessorintoadigitalvaluewhich isdisplayedinstantly.

Adjusting the Viewing Angle

The flip down wire stand will give you a better viewing angle

when the ADM1000 is placed above bench level. Simply pull

the stand down until it is in the locked position.

Taking a Flow Measurement

Make sure that the flow to be measured is within the range

of the flowmeter.Over ranging the flowmeter can damage

the transducer. Briefly press the on/split button. The display

will flash the message WARMUP. During this time, the micro-

processor will run a self-diagnostic test to ensure the system

is functioning correctly. Always turn the flowmeter on before

connecting to a flow source.

Connect the flexible tubing to the gas source to be measured,

wait for the reading to stabilize (1 - 2 seconds) and record the

reading.

1 ADM1000 Flowmeter

(battery included)

1 Instruction Manual

Agilent Flowmeter ADM1000

4 Operating Instructions

Important

When compared with readings from the ADM1000, measure-

ments taken with bubble-type flowmeters may show a differ-

ence. This is not a problem with your new ADM1000.

As a consequence of the ideal gas law, measurements made

with both soap bubble meters and the ADM1000 are tempera-

ture sensitive. However, bubble-type flowmeters add water

vapor to the gas being measured which introduces error into

the flow rate measurement.

Even when accurately calibrated, soap bubble meters typically

read slightly higher than the ADM1000. The higher readings

arise from relatively high concentrations of water vapor

present in the soap bubble apparatus. At room temperature,

water vapor can raise readings by nearly 4%. This unfortunate

property is amplified by the effect of temperature. As the mea-

sured gas or the flowmeter itself is warmed, the amount of

water vapor increases, and the readings can be much higher

than the true flow rate. Figure 1 shows the effect of water

vapor on volumetric flow measurements. Since theADM1000

is bubble-free, this error is not introduced into the flow rate

measurement.

NOTE Low flows (less than 1 mL/min) may take up to 5 seconds for

the reading to stabilize.

Agilent Flowmeter ADM1000

Operating Instructions 5

Autoranging Display

Themicroprocessorautomaticallyadjuststheresolutionofthe

display in response to various gas flow ranges as follows:

Auto/Manual Power Off

Every time the unit is activated, a “power-off” cycle begins,

lasting 10 minutes. If the flowmeter is not used during this

time, the unit will turn off. To conserve battery power, turn off

the instrument manually by pressing and holding the on/split

button until the sign off message appears.

Figure 1 Effectof temperatureandwatervaporonvolumetric

flow.

Flow (mL/min) Display resolution (mL/min)

0.50 - 9.99 0.01

10.0 - 99.9 0.1

100 - 1000 1.0

00 5 10 15 20 25 30 35 40 0

Temperature(˚C)

Watervaporpressure(psia)

%Increaseinreadingfrom

standardconditions

Effectoftemperatureand

watervaporonvolumetricflow

A %increase in volumetric flow due to temperature and

watervapor pressure

B %increase in volumetric flow due to temperature only

C Watervapor pressure

Agilent Flowmeter ADM1000

6 Operating Instructions

Low Battery Indicator

When the LOWBAT symbol is displayed, replace the battery.

(We recommend a standard 9V alkaline battery.) Install it by

removingthebatterycover onthebackofthecase.Changethe

battery and replace the cover.

Reading and Setting a Split Ratio

Turn the unit on by briefly pressing the on/split button. Con-

nect the flexible tubing from the ADM1000 to the GC column

gas flow*. When the reading stabilizes (1-2 seconds), briefly

presstheon/split button.(Note:Thedisplaywillshow anerror

message if the flow being measured is less than 0.5 mL/min.)

The reading is now stored in memory, and the display willread

1:1 . Disconnect the flexible tubing from the GC column flow

and connect it to the split vent. The display will now read the

ratio directly.The exact ratio can be dialed in by simply adjust-

ing the flow of the split vent until the required ratio is

displayed.

Typical display sequence for setting a 50.0:1 split ratio with a

2 mL/min column flow.

Returning to Single Flow

To return to single flow operation, briefly press the on/split

button.

* Accuratecolumn flow ratescan onlybe determinedwhen detec-

tor gases have been turned off.

2.00 mL

1.00:1

50.0:1

Agilent Flowmeter ADM1000

Operating Instructions 7

Recalibration and RepairService

To have your ADM1000 recalibrated or repaired, consult the

Agilent website for more information. Go to

www.chem.agilent.com and do a quick search for ADM

Flowmeters. Once there, look in the Technical Support section

for the recalibration/repair details.

Replacing Flexible Tubing

Whenreplacing theflexibletubing pleaseorder P/N701-0016.

This tubing is available by the foot; a minimum of 2 feet is nec-

essary.If tubingother thanthis isused,please cutto18 inches

(± 2 inches) in length. Important: If flows to be measured are

less than 200 mL/min and a greater length oftubing is desired

(greater than 18 inches) please order tubing extension kit

P/N 220-1179.

If tubing greaterin length than 18 inches is used without this

kit, errors in the displayed flow value may occur withflows

under 200 mL/min.

Product Specifications

•Flow range: 0.5 to 1000 mL/min, autoranging

•Accuracy ± 3% of reading, or ± 0.2 mL/min, whichever is

greater.

•Tubing temperature range: -62°C to 110°C

•Operating temperature range: 0°C to 45°C

•Power: 9V battery (alkaline)

•Display: 16 character alphanumeric

•Automatic power off

•Split ratio mode with continuous split flow rate reading

•NIST traceability

•Compatible with non-corrosive and non-flammable gases

•Self-checking power on sequence

•Each flowmeter individually computer calibrated.

Agilent Flowmeter ADM1000

8 Operating Instructions

Technical Support

Agilent’s Technical Support Specialists are chemists with

years of laboratory experience. They can provide you with

in-depth knowledge and experience. Contact Agilent technical

support; call 1-800-227-9770 in the US and Canada or call your

local Agilent sales office or to contact Technical Support on

the Internet, go to(www.agilent.com/chem).

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