CMM USER'S MANUAL (E2.51)
12
1.2.5 Measurement parameters
Zero point calibration:
24 hours
Span calibration:
24 hours
Zero point drift:
< 2% of measuring range per calibration interval
Sensitivity drift:
< 2% of measuring range per calibration interval
Linearity deviation:
< 2% of measuring range
1.2.6 Instrument air preparation
Instrument air inlet:
6 – 10 bars, 60 l/min, 8 mm Swagelok fittings
Instrument air filtration:
3-stage filter unit
Nitrogen generator:
Capacity 99 % N
2
, 8 l/min, 5-6 bars, efficiency ratio 20 %
Calibration gas drying:
Absorption dryer, capacity -30 °C
Mercury scrubber:
Absorption scrubber
Vacuum pump:
WOB-L piston twin headed
1.2.7 Alarm outputs
System alarm:
Gasmet CVAF mercury analyzer and application software
Service request:
Gasmet CVAF mercury analyzer and application software
Maintenance status:
Gasmet CVAF mercury analyzer and application software
Result valid:
Gasmet CVAF mercury analyzer and application software
Concentration alarm:
Gasmet CVAF mercury analyzer and application software
1.2.7.1 Concentration alarm
Concentration alarm is a user defined concentration alarm signal. It can be defined from MAUI
Program settings menu (Concentration alarm limits, Low and High). The alarm is only connected to a
digital output signal in the CMM cabinet, and is not visible in MAUI display or measurement data.
1.2.8 Air conditioning
Cooling capacity:
A35 °C / A35 °C 1500 W
Internal circulation:
500 m
3
/h
1.2.9 Dilution probe
Operating principle:
Ejector with critical orifice
Material:
SS 316, glass coated sample wetted parts
Operating temperature:
Maximum setting 250 °C (filter housing temperature)
Filter element:
Glass coated SS 316, 2 µm
Dust load:
< 2 g/m
3
Flow alarm:
Yes
Sample gas pressure:
0.9 – 1.2 bars (in stack)
Sample gas temperature:
400 °C (max, in stack)
