Emerson 6888Xi User Manual
8
Description and Specifications
Section 1: Description and Specifications
6888Xi Advanced Electronics Instruction Manual
December 2012
PN 51-6888Xi
Measurement Specifications
Net O
2
Range:
0 to 50% O
2
user scalable
-2 to 50% O
2
user scalable with stoichiometer
Lowest Detectable Limit:
0.01% O
2
Signal Stability:
±0.03% O
2
Accuracy in Reducing Conditions:
±10% of reading or 0.1% O
2
System Response in Reducing Conditions:
going from oxidizing to reducing -T90 in 120 seconds
going from reducing to oxidizing -T90 in 30 seconds
going from reducing to oxidizing -T90 in 30 seconds
Ambient Temperature Effect on Xi 4-20 mA Signal: less than 0.0025% O
2
per degree Celsius
Environmental Specifications
6888Xi Advanced Electronics:
Type 4X/IP66, Polycarbonate Material
Ambient Temperature Limits:
-20°C to 50°C (-4°F to 122°F)
-20°C to 70°C (-4°F to 158°F) as measured by electronics
-20°C to 70°C (-4°F to 158°F) as measured by electronics
6888Xi LCD display:
Ambient Temperature Limits
-20°C to 55°C (-4°F to 131°F)
General Purpose Certifications:
Installation Specifications
Mounting:
Panel, wall, or pipe.
Reference Air:
2 scfh (1L /min), clean, dry, instrument-quality air
(20.95% O
2
), regulated to 5 psi (34 kPa)
Calibration:
Semi-automatic or automatic
Cal Gases:
0.4% O
2
and 8% O
2
, balance N
2
recommended
Traditional Architecture Cable
200 ft (61 m) maxmum length
Transmitter Electrical Power:
12 - 24 VDC (loop-powered from control room or 6888Xi)
Electrical Power for 6888Xi:
120/240VAC ±10%, 50/60 Hz
Power Consumption of 6888Xi:
12 VA maximum or 1020 VA maximum with Traditional
Architecture,120V Probes
Alarm Relay Outputs:
Two provided - 2 Amperes, 30 VDC, Form-C
Optional Loss of Flame Input:
Internally powered input to remove heater power
actuated via dry contact output from user’s* flame scanner
Emerson Process Management has satisfied all obligations from the European legislation to harmo-
nize the product requirements in Europe. 1All static performance characteristics are with operating
variables constant. Specifications subject to change without notice.
1.3
Specifications