Agilent Technologies Flow Tracker Series Manual de usuario

Agilent Technologies

Agilent

Flow Tracker Series

1000/2000

Reference Manual

2Reference Manual

Notices

No part of this manual may be reproduced in

any form or by any means (including elec-

tronic storage and retrieval or translation

into a foreign language) without prior agree-

ment and written consent from Agilent

Technologies, Inc. as governed by United

States and international copyright laws.

Microsoft ® is a U.S. registered trademark

of Microsoft Corporation.

Edition

Second edition, May 2002

First edition, August 2001

Printed in USA

Agilent Technologies, Inc.

2850 Centerville Road

Wilmington, DE 19808-1610 USA

Safety Notices

CAUTION

A CAUTION notice denotes a haz-

ard. It calls attention to an operat-

ing 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 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 per-

formed or adhered to, could result

in personal injury or death. Do not

proceed beyond a WARNING

notice until the indicated condi-

tions are fully understood and

met.

Agilent Flow Tracker Series 1000/2000

Reference Manual

Agilent Technologies

Flow Tracker Series 1000/2000

Safety Information 4

Installation 6

Flow Measurement Operating Principle 9

Basic Operation 10

Operating Modes 14

RS-232 Output 29

Maintenance and Recalibration 32

Flow Tracker 1000/2000 Flow Measurement Specifications 34

Flow Tracker 2000 Leak Detector Specifications 35

The Agilent Flow Tracker 1000 and 2000 Series Gas

Chromatography flowmeters are designed to provide useful

flow information in one simple, reliable, and portable

instrument. The Flow Tracker 1000 has two operating modes,

Flow mode and Gas Chromatography (GC) mode. The Flow

Tracker 2000 has an additional Leak Detector mode and

incorporates a separate, built–in sampling pump and probe.

The Flow Tracker data presentation format uses a multi-line

LCD display that allows simultaneous viewing of all parameters

associated with the current operating mode. Selected

parameters can be brought to the enlarged “Primary Data”

position to simplify viewing of the parameter in which the user

is most interested at any given time.

The Flow Tracker RS-232 output allows data from the current

operating mode to be streamed in real-time to a laptop

computer for collection or analysis without specialized

software.

4Reference Manual

Flow Tracker Series 1000/2000

Safety Information

General

For indoor use only. This product should not be used in

hazardous locations. This product is rated as Safety Class II,

Installation category II, and Pollution Degree 2. If this

equipment is used in a manner not specified, the protection

of the equipment may be impaired. Agilent Technologies

assumes no liability for the customer’s failure to comply with

these requirements.

• Operating temperature range is 10—50 °C.

• Operating humidity range is 0—90% RH (noncondensing).

• Maximum recommended altitude is 15,000 ft.

Electromagnetic compatability

This device has been tested and found to comply with the limits

of CISPR 11. These limits are designed to provide reasonable

protection against harmful interference in an installation. This

equipment generates, uses, and can radiate radio frequency

energy. If not installed and used in accordance with the

instructions, this device may cause harmful interference to

radio or television reception. This can be determined by turning

the equipment off and on. The user is encouraged to try to

correct any interference by taking one or more of the following

measures:

•Reorient or relocate the receiving antenna.

•Increase the separation between the equipment and the

receiver.

•Connect the equipment into an outlet on a circuit different

from that to which the receiver is connected.

•Consult the dealer or an experienced radio/TV technician for

help.

Unauthorized modification or installation of this equipment

may invalidate the user’s ability to operate this equipment.

Flow Tracker Series 1000/2000

Reference Manual 5

This ISM device complies with Canadian ICES-001.

Cet appareil ISM est conforme a la norme NMB-001 du Canada.

This device is CE marked for ISM Group 1, Class A equipment.

6Reference Manual

Flow Tracker Series 1000/2000

Installation

The Agilent Flow Tracker Series flowmeters have standard

1/8-inch NPT (female) inlet and outlet fittings as shown in

Figure 1. To prevent possible clogging of the internal structure,

it is recommended that a 20-micron filter be installed upstream

of the flowmeter. The unit is packaged with simple plastic hose

barbs for your convenience, however any fitting that is

appropriate for the application can be substituted.

Figure 1 Connections

RS-232 plug

Leak sampling probe

(Flow Tracker 2000 only)

AC adapter plug

Exhaust

Flow

Sample exhaust

(Flow Tracker 2000 only)

Probe receptacle

RS-232 jack

P1 100 psi

≤

Flow Tracker Series 1000/2000

Reference Manual 7

Maximum operating line pressure is 100 PSIG (690 kPa) If the

line pressure is higher than 100 PSIG (690 kPa), a pressure

regulator must be used upstream from the flowmeter to reduce

the pressure to 100 PSIG (690 kPa) or less. Although the

flowmeter’s operation is unidirectional, reversing the direction

of the flow will not inflict any damage as long as the maximum

specified limits are not exceeded. The differential pressure

sensor used in the Flow Tracker is a very sensitive device

capable of detecting minute differences in pressure.

RS-232 output cable The Agilent Flow Trackers are equipped

with an 8-pin mini-DIN data output jack located as shown in

Figure 1. The included data cable plugs into this jack with the

flat on the cable plug towards the back of the flowmeter. If the

serial port on your computer is female, the flowmeter can

simply be plugged into your serial port via the included 8-pin

mini-DIN to DB-9 serial adapter cable. If the serial port on your

computer is male, you will need a common double–ended

female adapter cable.

CAUTION When installing fittings into the NPT ports, do not exceed 12 ft-lbs of

torque.

NOTE Use of pipe dopes and sealants on the NPT ports can cause permanent

damage to the flowmeter should they get into the flow stream. If a thread

sealing tape is required, avoid wrapping the first thread or two to minimize

the possibility of getting a piece of shredded tape into the flow stream.

When changing fittings, always clean any tape out of the threads that may

come loose and enter the flow stream.

CAUTION Exceeding the maximum specified line pressure may cause permanent

damage to the solid-state differential pressure transducer. Avoid

installations (such as snap–acting solenoid valves upstream) that

apply instantaneous high pressure to the flowmeter as permanent

damage to the differential pressure sensor could result.

8Reference Manual

Flow Tracker Series 1000/2000

Power/batteries Power is supplied by six (6) standard AA size

batteries or by an optional AC/DC adapter (Part number

5183-4781). New batteries can provide power for several days of

continuous operation depending on the quality of the batteries

and whether the leak sampling pump (Flow Tracker 2000) is

used. The power adapter jack is located as shown in Figure 1. A

P-5 style, positive center 6-15 Vdc adapter rated for at least

100 mA is required.

To install the batteries:

1Remove the flexible boot from the flowmeter housing.

2Remove all three screws from the back cover.

3Carefully remove the back cover to expose the battery

housing.

4Install the batteries as shown on the back cover.

5Replace the back cover and re-install the screws.

6Replace the flexible boot, pushing the bottom end of the

flowmeter into the boot first.

NOTE The auto-off feature automatically shuts the flowmeter off after

approximately 5 minutes of continuous no flow (less than 4 mL/min)

condition. This applies only under battery power. The auto-off feature is

disabled when power is supplied via an AC to DC adapter.

Flow Tracker Series 1000/2000

Reference Manual 9

Flow Measurement Operating Principle

The volumetric flow rate is determined by creating a pressure

drop across a unique internal restriction (known as a Laminar

Flow Element) and measuring differential pressure across it.

The restriction is designed so that the gas molecules are forced

to move in parallel paths along the entire length of the passage;

hence Laminar (streamline) flow is established for the entire

range of operation of the device.

Unlike other flow measuring devices, in laminar flowmeters the

relationship between pressure drop and flow is linear. The

underlying principle of operation of the Agilent Flow Tracker

Series flowmeters is known as the Poiseuille Equation:

Since π, r and L are constant, this equation can be rewritten as:

The second equation shows the linear relationship between

volumetric flow rate (Q), differential pressure (∆P), and

absolute viscosity (η) in a simpler form.

Q = (P1-P2)πr4/8ηL

where: Q = volumetric flow rate

P1 = static pressure at the inlet

P2 = static pressure at the outlet

r = radius of the restriction

η = (eta) absolute viscosity of the fluid or gas

L = length of the restriction

Q = K (∆P/η)

where: K= a constant factor determined by the geometry of the

restriction.

10 Reference Manual

Flow Tracker Series 1000/2000

Basic Operation

Operation of the Agilent Flow Tracker Series flowmeters is very

intuitive. The operating modes are explored in considerable

detail in the Operating Modes section.

In general, each operating mode displays all of the parameters

that are associated with that mode of operation. Each

parameter has a button associated with it and is labeled either

by a “dynamic label” on the display, or, if it is a global parameter

(a parameter which is common to all modes) the associated

button is labeled directly. The two global parameters are GAS

and MODE.

Dynamically labeled parameters are either active or passive.

Active parameters are directly affected by the flow and are

constantly changing. These parameters can be moved to the

primary display by pushing the button associated with them.

Passive parameters are usually variables that require input

from the user. The buttons associated with passive parameters

are used to select the value of the variable.

A quick overview of the operating modes and their parameters

is given in Table 1, Table 2, and Table 3.

Table 1 Flow mode (default on power up)

Parameter Label Active/Passive Button action

Line pressure PSIA Active Primary display

Gas temp °C Active Primary display

Volumetric flow Vol Active Primary display

Mass flow Mass Active Primary display (default)

Gas GAS Passive Toggles through gas list

Operating mode MODE Passive Toggles through modes

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