Agilent Technologies ADM2000 User manual

Agilent
Flowmeter
ADM2000
Operating
Instructions

Notices
© Agilent Technologies, Inc. 2003
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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
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2
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3
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.
12
14
16
18
20
5
9
10
7
8
6
4
3
2
1
00 5 10 15 20 25 30 35 40 0
2
4
6
8
10
Temperature(˚C)
A
B
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.