Agilent Technologies ADM2000 Manual de usuario

Agilent

Flowmeter

ADM2000

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-0047

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

thefurnishing,use,orperformanceofthis

documentorofanyinformationcontained

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 documentare 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.

Microsoft®and Windows®are registered

trademarks of Microsoft Coporation.

PROCOMM®is a registered trademark of

Data Storm Technologies, Inc.

Agilent Flowmeter ADM2000

Operating Instructions

Agilent Flowmeter

ADM2000

Packing List

Thank you for choosing Agilent's ADM2000 Flowmeter. When

unpacking the box, please make sure it contains the following

items:

1 ADM2000 Flowmeter

(battery included)

1 Instruction Manual

1PowerAdapter

1 RS232 Cable Adapter

Agilent Flowmeter ADM2000

4 Operating Instructions

Principle of Operation

The ADM2000 provides continuous, real time measurements

of NON-CORROSIVE AND NONFLAMMABLE GAS FLOWS .

Unlike bubble flowmeters, the ADM2000 operates without liq-

uids, bubbles or glass parts. When activated, a solenoid actu-

ated valve interrupts the gas flow momentarily. The gas flow

moves a diaphragm in proportion to the flow rate. This move-

ment is transformed by the microprocessor into a digital value

whichisdisplayedinstantly.TheADM2000providestwodiffer-

ent types of flow measurement: volumetricflow (mL/min) and

mass flow (sccm). Mass flow values are calculated from the

volumetric measurements by correcting for temperature and

pressure.

Adjusting the Viewing Angle

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

when the ADM2000 is placed above bench level. Simply pull

the stand down until it is in the locked position.

Menu Button

The Menu button is used to scroll through and select different

operational modes. Briefly press the Menu button until your

choice appears on the display. Once the desired mode is

displayed, the On button may be pressed momentarily or the

unit will automatically enter the selected mode in 5 seconds.

The available modes are as follows:

1 Volumetric Flow Mode/Split Ratio

Thisisthedefaultmodeonpowerup.Inthismode,theflow

rate is displayed in mL/min.

2MassFlowMode

In this mode, the volumetric flow rate is corrected for atmo-

spheric pressure and ambient temperature. The flow rate is

displayed in sccm, standard cubic centimeters per minute.

Momentarily pressing the On button while in any mode will

return the flowmeter to the volumetric flow mode.

Agilent Flowmeter ADM2000

Operating Instructions 5

Auto-off

When the unit is turned on, the default is auto-off engaged.

This means the following: 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 button until the “sign off” message

appears.

The Menu button is used to disable this feature. On initial

power up while the display shows WARMUP, press and hold

the Menu button until AUTO-OFF DISABLE is displayed. The

flowmeter will now operate continuously until it is manually

turned off.

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 pressthe On button.Thedisplaywill flash themessage

WARMUP . During this time, the microprocessor will run a

self-diagnostic test to ensure the system is functioning cor-

rectly.Always turn the flowmeter on before connecting it to a

flow source. Select the desired mode if other than volumetric

flowisneeded.Connecttheflexibletubingtothegassourceto

be measured, wait for the reading to stabilize (1 - 2 seconds)

andrecordthe reading.Toconserve battery power, turn off the

instrument manually by pressing and holding the On button

until the “sign off” message appears.

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

the reading to stabilize.

Agilent Flowmeter ADM2000

6 Operating Instructions

Important

When compared with readings from the ADM2000, measure-

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

ence. This is not a problem with your new ADM2000.

As a consequence of the ideal gas law, measurements made

with both soap bubble meters and the ADM2000 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 ADM2000. 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 the ADM2000

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

measurement.

Agilent Flowmeter ADM2000

Operating Instructions 7

Figure 1 Effectoftemperatureandwatervaporonvolumetric

flow.

00 5 10 15 20 25 30 35 40 0

Temperature(˚C)

Watervaporpressure(psia)

%Increaseinreadingfrom

standardconditions

Effectoftemperatureand

watervaporonvolumetricflow

A %increasein volumetricflowdue totemperature and

watervaporpressure

B %increasein volumetricflowdue totemperature only

C Watervaporpressure

Agilent Flowmeter ADM2000

8 Operating Instructions

Reading and Setting a Split Ratio

Turn the unit on by briefly pressing the On button. Connect the

flexible tubing from the ADM2000 to the GC column gas flow*.

Whenthereadingstabilizes(1-2seconds),brieflypresstheOn

button. (Note: The display will show an error 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 ventuntil the required ratio is

displayed.

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

2.00 mL/min column flow.

Returning to Single Flow

To return to single flow operation, briefly press the On button.

You can also return to single flow operation by pressing the

Menu button and scrolling through the options to volumetric

flow mode.

* Accuratecolumnflow rates canonlybe determined whendetec-

tor gases have beenturned off.

2.00 mL

1.00:1

50.0:1

Agilent Flowmeter ADM2000

Operating Instructions 9

Autoranging Display

Themicroprocessorautomaticallyadjusts theresolutionofthe

display in response to various gas flow ranges as follows:

Low Battery Indicator

When the LOWBAT symbol is displayed, replace the battery.

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

removingthebatterycoveronthebackofthecase.Changethe

battery and replace the cover.

RS232 Data Port

The ADM2000 is an RS232 output device. That is, it is capable

of outputting ASCII data through an RS232 standard serial

interface.Data fromyourflowmeter can becollected using the

RS232 interface and your PC’s serial (RS232) port.Included

with the flowmeter is an RS232 cable with a DB25 connector

wired as a null modem. If your computer has a DB9 connector,

you will need to buy an adapter that converts from DB25 to

DB9. Once connected, data is easily collected using one of

many commercially available communication programs, such

as PROCOMM®Plus by DataStorm Technologies, Inc.or the

Windows®Terminal program by Microsoft. You will need to set

your communication parameters to:

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

0.50 - 9.99 0.01

10.0 - 99.9 0.1

100 - 1000 1.0

9600 Baud

8 Data bits

No parity

1 Stop bit

Agilent Flowmeter ADM2000

10 Operating Instructions

ADMFlowmeterControlSoftwareis availablefrom the Agilent

website free of charge. This trending and archiving software

for the ADM2000 and ADM3000 is available in two versions to

help you collect test data. To download, go to

www.agilent.com/chem and look in the technical support

section under ADM Flowmeters.

Other options include purchasing a software wedge, which

directly imports serial data to the keyboard buffer, or writing a

BASIC program to capture the data using a COM port.

Replacing Flexible Tubing

WhenreplacingtheflexibletubingpleaseorderP/N701-0016.

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

necessary. If tubing other than this is used please cut to

18 inches (± 2 inches) in length. Important: If flows to be mea-

sured are less than 200 mL/min and a greater length of tubing

is desired (greater than 18 inches) please order tubing exten-

sion kit P/N 220-1179. If tubing greater in length than

18 inches is used without this kit, errors in the displayed flow

value may occur with flows under 200 mL/min.

Replacement Power Transformers and Adapter Cables

Toorderareplacement100-240 Vuniversalpowertransformer,

order P/N 5185-5924. The transformer must be usedwith the

RS232 Cable Adapter that is supplied with the unit. For a

replacement RS232 Cable Adapter, order P/N 007-1175.

Recalibration and Repair Service

To have your ADM2000 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, lookin the Technical Support section

for the recalibration/repair details.

NOTE When using the RS232 data acquisition capability of the

ADM2000, it is advisable to disable the auto-off feature. See

previous section on auto-off.

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