Emerson World Class 3000 Manual de instrucciones descargar pdf (Pagina 53)

Instruction Manual

106-300NFX Rev. 4.2

January 2002

Rosemount Analytical Inc. A Division of Emerson Process Management Setup and Operation 3-11

World Class 3000

3 Two, 2-stage pressure regu-

lators with stainless steel dia-

phragms for tanks. Maximum

output required: 138 kPa (20

psi).

4 One instrument air pressure

regulator: 138 kPa (20 psi)

maximum and a supply of

clean, dry instrument air.

5 Two zero-leakage shutoff

valves.

6 Miscellaneous oil-free tubing

and fittings.

(b) Calibration

1 A typical calibration setup is

shown in Figure 3-2. Care

must be taken that all fittings

are tight and free from oil or

other organic contaminants.

Small openings can cause

back diffusion of oxygen from

the atmosphere even though

positive pressures are main-

tained in the lines.

NOTE

The probe calibration gas fitting has a

seal cap which must be in place at all

times except during calibration.

In addition to the precision

calibration gas mixtures,

clean, dry, oil-free instrument

air should be used for calibra-

tion.

For optimum accuracy, this calibration

should be run with the process at

normal temperature and operating

conditions.

When the calibration gas line

exceeds 1.8 m (6 ft) in length

from the leak tight valves, a

check valve, Rosemount P/N

6292A97H02, should be in-

stalled next to the calibration

gas connection on the probe

to prevent breathing of the

line with the process gas and

subsequent gas condensation

and corrosion.

REFERENCE AIR

CONNECTION

REFERENCE

AIR

SET

FLOW METER

INSTR.

AIR

LEAK TIGHT

VALVES

2 SCFH

5 SCFH

PROBE

(END VIEW)

CALIBRATE

IN-PLACE

FITTING

CHECK

VALVE

REG

8.0%

0.4%

PROBE CALIBRATION GAS FITTING HAS A SEAL CAP THAT MUST

BE IN PLACE AT ALL TIMES EXCEPT DURING CALIBRATION.

NOTE:

730013

Figure 3-2. Typical Calibration Setup

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 157 158

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