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8 Description and Specifications
S
ection 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
S
ignal 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
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
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