MBRAUN MB 120B-G, Operating Instructions Manual

Page: 85 / 105

Technical data
Mechanical
Length over all: . . . . . . . . . . . . . . . . 205 mm, height 80 mm, depth 58 mm
Sensor-part: . . . . . . . . . . . . . . . . length 42 mm, diameter 14 mm
Flange: . . . . . . . . . . . . . . . . NW 40 KF
Weight: . . . . . . . . . . . . . . . . 0.7 kg
Electrical
Supply voltage: . . . . . . . . . . . . . . . . 24 VDC +- 10%
Environment
Ambient temperature: . . . . . . . . . . . + 15 to + 35 °C
Pressure: . . . . . . . . . . . . . . . . 800 to 1200 mbar ( Differential pressure sensor to electronics
max. ±100 mbar)
Measuring
Range: . . . . . . . . . . . . . . . . 0 - 500 ppm moisture
Sensitivity: . . . . . . . . . . . . . . . . 20 mV / ppm
Response time (0 - 90 %): . . . . . . . approx. 120 sec. (0 - 90 %)
Warm-up time: . . . . . . . . . . . . . . . . 10 minutes ( for < 10 ppm approx. 6 hours)
Accuracy
1)
: . . . . . . . . . . . . . . . . high precision range (0 - 10 vpm): better than 5 % of value
wide range (10 - 100 vpm): better than 20 % of value
Drift at 10 vpm: . . . . . . . . . . . . . . . . 10 % / year
Sensor life
2)
: . . . . . . . . . . . . . . . . at least 5 years
1) without interfering gases like NH
2
2) with regular maintenance
Maintenance: sensor cleaning
To achieve optimal moisture measurements
,
the sensor is recommended to be closely inspected
within a period of three months . This routine maintenance consists
of
cleaning the platinum winding of the
MB MO-SE-1 and moistening it with phosphorous acid H
3
PO
4
.
The following aids are required for disassembling and maintaining the MB MO-SE-1.
Tool for disassembly (screwdriver)
Soft, absorbent, lintfree cloth (cotton)
Small quantity of phophorous acid H
3
PO
4
.
Protective gloves and goggles
One dummy plug for the open circulation piping (mostly DN40)
Chapter 14
Analyzers
86