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Instruction Manual
1 Introduction / General Information
1.1 Description
The CDM900 Micro Bee™ Capacitance Diaphragm vacuum gauge is an economical, gas type independent absolute pressure
sensor. The CDM900 provides excellent long term stability and performance. The sensor assembly is constructed of a
compact ceramic and metal design resulting in a simple yet rugged sensor suitable for numerous industrial applications.
The corrosion resistant sensor material provides excellent temperature compensation capability, thus enhancing the
reliability of the pressure measurements.
The CDM900 Micro Bee vacuum gauge module provides the basic signal conditioning required to turn the sensor into a
complete vacuum pressure measurement instrument. The combination of superior sensor design and enhanced signal
processing provides optimal and stabile pressure readings by the instrument. The built-in controller provides a 0 to 10 Vdc
analog output for pressure measurements and allows for local or remote zeroing of the instrument. The CDM900 provides
various full scale ranges from 10 to 1,000 Torr.
1.2 Specifications
full scale (F.S.) ranges - Torr
lowest reading
accuracy
(1)
temperature effect on zero
temperature effect on span
resolution
long term stability
temperature compensated range
materials exposed to gases
sensor, feedthrough
flange, tube
internal gauge volume
temperature compensation range
temperature
humidity
bakeout temperature (at flange)
admissible pressure (absolute)
burst pressure
weight
housing (electronics)
use
mounting orientation
altitude
analog output
output impedance
load impedance
InstruTech
1000, 500, 200, 100, 50, 20, 10
0.05% of F.S.
model A: 1% of reading
model B: 0.5% of reading
0.02% F.S./ °C
0.02% of reading/°C
0.05% F.S.
0.5% F.S./yr aluminum oxide ceramic (AI
+10 to +50 °C
aluminum oxide ceramic (AI
2
stainless steel AISI 316L
1/2 in. Tube
3
: 0.219 in
(3.6 cm
KF16: 0.226 in
3
(3.7 cm
3
)
3
4 VCR & 8 VCR: 0.342 in
(5.6 cm
+ 10 to + 50
o
C
operating: 0 to + 70
o
C
storage: -20 to + 85
o
C
0 to 80% relative humidity, non-condensing
o
≤ 110
C (non-operating)
≥ 500 Torr F.S. = 58 psi (4 bar)
50 to 200 Torr F.S. = 43.5 psi (3 bar)
10 to 20 Torr F.S. = 29 psi (2 bar)
87 psi (6 bar)
4 to 5.7 oz. ( 115 to 160 g) , flange/fitting dependent
aluminum extrusion
indoor only
any
13,125 ft. (4000 m) max
linear 0 to 10 Vdc
10 , short-circuit proof
>10 k
O
)
2
3
O
)
3
3
)
3
)
CDM900 Micro Bee
Page 2
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