Emerson Process Management 3000 - Manual (Page 64)

Instruction Manual
IB-106-300NH Rev. 4.2
July 2002
4-4 Calibration Rosemount Analytical Inc. A Division of Emerson Process Management
World Class 3000
REFERENCE AIR
CONNECTION
REFERENCE
AIR
SET
FLOW METER
INSTR.
AIR
IN LEAK TIGHT
VALVES
2 SCFH
5 SCFH
PROBE
(END VIEW)
CALIBRATE
IN-PLACE
FITTING CHECK
VALVE
REG
0.4%
O
2
8.0%
O
2
PROBE CALIBRATION GAS FITTING
HAS A SEAL CAP WHICH MUST
BE IN PLACE AT ALL TIMES
EXCEPT DURING CALIBRATION. NOTE:
Figure 4-1. Typical Calibration Setup
NOTE
Only set the calibration gas flowmeter
upon initial installation and after
changing the diffusion element. A
slightly lower calibration gas flow rate
may indicate a plugged diffusion
element.
2 Set the calibration gas pres-
sure regulators and the flow
meter for a flow of 5 SCFH at
20 psi (138 kPa) for both
gases. The reference air
should be flowing as in normal
operation.
3 Refer to paragraph 4-2d of
this section for Manual (Semi-
automatic) Calibration setup
and procedure using the IFT.
4 Calibration gases will be
switched on and off using the
shutoff valves.
Test Method "B" Rosemount Oxygen
Calibration Gas and Service Kit.
(a) Required Equipment
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.
NOTE
Ambient air is not recommended for
use as high calibration gas. An 8% O
2
balance in nitrogen is recommended
for high calibration gas.
1 Portable Rosemount Oxygen
Calibration Gas Kits (Figure
4-2), Rosemount P/N
6296A27G01, containing 8%
and 0.4% gases in a portable
carrying case with regulator,
built-in valve, hose and con-
necting adapter to the calibra-
tion gas connection.