Agilent Technologies ADM1000 Bedienungsanleitung
Agilent
Flowmeter
ADM1000
Operating
Instructions
Notices
© Agilent Technologies, Inc. 2003
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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
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3
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
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 %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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