Emerson World Class 3000 Manual de instrucciones descargar pdf (Pagina 56)

Instruction Manual

106-300NFX Rev. 4.2

January 2002

3-14 Setup and Operation Rosemount Analytical Inc. A Division of Emerson Process Management

World Class 3000

e. Fully Automatic Calibration

Consult Safety Data Sheet 1M03296

before performing any work on the

CENELEC approved IFT 3000.

1. Test Gases for Fully Automatic Cali-

bration. For fully automatic calibration,

an MPS 3000 Multiprobe Test Gas Se-

quencer is required as well as the two

types of test gas.

Do not use 100% nitrogen as a zero

gas. It is suggested that gas for the

zero be between 0.4% and 2.0% O

2

. Do

not use gases with hydrocarbon con-

centrations of more than 40 parts per

million. Failure to use proper gases

will result in erroneous readings.

Two tanks of precision calibration gas

mixtures. Recommended calibration

gases are nominally 0.4 percent and

8.0 percent oxygen in nitrogen.

A typical automatic calibration system

is shown in Figure 3-5.

2. Fully Automatic Calibration Setup. In

order for the IFT system to calibrate

automatically, the following parameters

from the CALIBRATE sub-menu in the

IFT have to be entered. Refer to Table

3-5. SETUP Sub-Menu.

(a) Auto Cal YES/NO

Set to YES

(b) Output Tracks YES/NO

Set as desired to configure analog

output tracking.

(c) Cal Intrvl XD XH

Set the desired time between cali-

brations in number of days and

hours. (1 year max.)

(d) Next Cal. XD XH

Displays the time left to the start of

the next calibration. Set the de-

sired time until the start of the next

calibration. If nothing is entered

here, the unit will automatically

enter the cal intrvl and count down

from that. (1 year max.)

(e) Gas Time 0:00

Set the amount of time for the test

gasses to be turned on in number

of minutes and seconds, allow

enough time for signal values to

stabilize.

(f) Purge Time 0:00

Set the amount of time for the gas

lines to clear in number of minutes

and seconds.

(g) Abort Time 0:00

Set the amount of time allowed

between key functions before the

calibration procedure is aborted in

number of minutes and seconds.

(h) Res Alarm _____

Set the desired resistance alarm

between 50 - 10000 ohms.

Once these parameters have been set,

the system will initiate calibration with-

out operator intervention as set by the

CAL INTVL parameter.

3. Manually Initiated Fully Automatic Cali-

bration Procedure. The following pro-

cedure relates to an operator initiated

calibration, either by a remote switch

(CAL INIT on interconnect board) or

selected at the IFT by pressing the

CAL key using an MPS 3000 Multi-

probe Gas Sequencer.

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