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Instruction Manual
1 Introduction / General Information
1.1 Description
The PCM301 Busy Bee™ vacuum gauge module combines pirani technology with a ceramic capacitance
diaphragm sensor to provide repeatable and accurate readings
dependent which allows for safe venting of any gas mixture. The Capacitance Diaphragm is a gas type
independent absolute pressure sensor. It provides excellent long term stability and performance. The
capacitance diaphragm 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 pirani sensor measures pressure indirectly by sensing the loss of heat from a sensor to the
surrounding gases. The higher the pressure of the surrounding gas, the more heat is conducted away from the
sensor. Pirani thermal conductivity gauges maintain a sensor (usually a wire) at some constant temperature,
and measure the current or power required to maintain that temperature.
The PCM301 provides the basic signal conditioning required to turn the sensor into a complete vacuum pressure
measurement instrument. The built-in controller provides a display with a log-linear analog output and two
setpoint relays. The capacitance diaphragm sensor is used for pressure measurements from 7.6 to 1,125 Torr.
The measurement range from 7.6 to 7.6 x 10
the pirani and the capacitance sensors are used proportionally. Below 7.6 x 10
to measure the pressure. The entire measurement range for the PCM301 Pirani Capacitance combination gauge
-5
is 3.8 x 10
to 1,125 Torr.
1.2 Specifications
measurement range
measurement principal
3.8 x 10
-5
to 7.6 x 10
7.6 x 10
7.6 to 1,125 Torr
accuracy - N
(typical)
2
repeatability - (typical)
materials exposed to gases
internal gauge volume
admissible pressure
burst pressure
temperature
relative humidity
bakeout temperature
weight
housing (electronics)
use
InstruTech
-1
Torr is considered the crossover range where signals from both
-5
3.8 x 10
to 1,125 Torr / 5 x 10
-1
Torr
pirani
-1
to 7.6 Torr
crossover range
capacitance diaphragm
3.8 x 10
-4
to 7.6 x 10
-4
7.6 x 10
to 75 Torr: ± 15% of reading
75 to 715 Torr: ± 5% of reading
715 to 790 Torr: ± 2.5% of reading
7.6 x 10
-4
to 825 Torr: ± 2% of reading
W, Ni, NiFe, AI
1/8 in. NPT: 0.32 in
1.33 in. Mini-CF: 0.49 in
16KF long tube: 0.88 in
≤ 72.5 psi (5 bar) absolute
145 psi (10 bar) absolute
operating: + 10 to + 50
annual average: 0 to 65%
o
≤ 80
C at flange
4 to 4.5 oz. (115 to 130 g)
aluminum extrusion
indoor only
Above 7.6 Torr, the measurement is not gas
.
-5
to 1,500 mbar / 5 x 10
-4
Torr: ± 50% of reading
O
, SnAg, stainless steel, glass
2
3
3
(5.2 cm
3
), KF16: 0.29 in
3
(8 cm
3
), 8 VCR: 0.43 in
3
(14.5 cm
3
),
1.33 in. Mini-CF long tube: 0.85 in
o
C
storage: -20 to + 65
during 60 days: 0 to 85% , non-condensing
o
≤ 250
C at flange with the long tube option
PCM301 Busy Bee
-1
the pirani sensor is strictly used
-3
Pa to 150 kPa
3
(4.7 cm
3
),
KF25 & 4 VCR: 0.34 in
3
(7 cm
3
)
3
o
C
3
(5.5 cm
3
)
(14 cm
3
)
Page 3
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