Teledyne 7600 - Infrared gas analyzer - operating manual - Manual (Page 116)

Appendix Model 7600
Teledyne Analytical Instruments 116
CO concentration peak count alarm: (added only for CO/O
2
measurement) Alarm output turns on
according to the pre-set concentration and
count.
Whenever the instantaneous value of CO
exceeds the preset concentration value,
count increments. If the count exceeds the
preset value in one hour, the alarm
contacts close.
Communication function: RS-232C (9 pin D-sub)
Half-duplex bit serial
Start-stop synchronization
Modbus TM protocol
Contents:
Read/Wright parameters
Read measurement concentration and
instrument status
Remark:
When connecting via RS-485
interface, a RS-232C↔RS-485
converter should be used.
A.4 Performance:
Repeatability: ±0.5% of full scale
Linearity: ±1% of full scale
Zero drift: ±1% of full scale/week
(±2% of full scale/week; range between 0
to 50ppm and 0 to 200ppm)
(±2% of full scale/day; below 0 to 50 ppm
range)
Span drift: ±2% of full scale/week
(±2% of full scale/day; below 0 to 50 ppm
range)