Emerson 3081FG Reference Air Package, Instrument Air Reference Air, Calibration Check Gas

Model 3081FG

Instruction Manual

IB-106-3081 Rev. 1.5 September 2002

FACTORY-INSTALLED	CELL+(BK)	CELL-(WH) THERMOCOUPLE-(RD)		THERMOCOUPLE+(GY)
JUMPER
TERMINAL	7	8	9	10
BLOCK (TB1)
	6			11

	5	12
PROBE CABLE	4	13
	3	14
SHIELD	2	15
	1
GROUND		16

EARTH GROUND TERMINALS

4-20 mA (-)

4-20 mA (+)

b. Reference Air Package

After the oxygen probe is installed, connect

the reference air set. Install the reference air 2 set according to Figure 2-12.

c.	Instrument Air (Reference Air)
	Instrument air is required for reference. Use
	10 psig (68.95 kPa gage) minimum, 225
	psig (1551.38 kPa gage) at 0.2 scfh (100
	ml/min.); less than 40 parts-per-million total
	hydrocarbons. Regulator outlet pressure
	should be set at 5 psi (35 kPa).
d.	Calibration Check Gas
	Two calibration check gas concentrations

CELL AND	4-20 mA
THERMOCOUPLE

CONDUITS

NOTE: RUN CELL AND THERMOCOUPLE SIGNALS IN SEPARATE CONDUIT FROM 4-20 mA LINE.

26020005

Figure 2-10. Model 3081 Transmitter Terminal

Block

2-4 PNEUMATIC INSTALLATION

a.General

Reference air is required for O2 calculation, and calibration check gas is required during a calibration check. Refer to Figure 2-11 for the gas connections on the oxygen probe.

are used with the Two-Wire In Situ Oxygen

Analyzer: Low Gas - 0.4% O2 and High Gas

- 8% O2, each with the balance in nitrogen.

Do not use 100% nitrogen. See Figure 2-11

for the probe connections. Set both calibra-

tion check gases at the same flow rate: 5

scfh (2.5 L/min).

1/4 TUBE FITTING (REFERENCE AIR PORT)

1/4 TUBE FITTING (CALIBRATION CHECK GAS PORT)

REFERENCE

AIR VENT 26020006

Figure 2-11. Oxygen Probe Gas Connections

Rosemount Analytical Inc. A Division of Emerson Process Management Installation 2-11