FIS SB-EN3 User Manual [en, zh]

Page 1
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FIS GAS SENSOR
SB-EN3
for MOUTH ODOUR LEVEL MONITORING
The SB-EN3 is a tin dioxide semiconductor gas sensor which was specially developed for mouth odour level monitoring. This sensor has a high sensitivity to sulphur
Heater coil
Gas sensitive semiconductor
e
Lead wir
0.5 mm
compounds and hydrocarbons which can be produced in the mouth depending on the conditions of mouth and/or human body.
Structure
Gas sensitive semiconductor
Fig 1a. Sensing element Fig 1b. Configuration
0.3 mm
(side view)
material is a mini bead type and a heater coil and electrode wire are embedded in the element. The sensing element is installed in the metal housing which uses double stainless steel mesh (100 mesh) in the path of gas flow. The mesh is an anti-explosion feature (Fig 1).
Operating conditions
Fig 2 shows the standard operating circuit for this model. The change of the sensor resistance (R as the change of the output voltage
) is obtained
S
across the fixed or variable resistor (R
). In order to obtain the best
SB-EN3
L
performance and specified characteristics, the values of the heater voltage (V
) circuit voltage
H
Fig 1c. Pin Layout
(V
) and load resistance (R
C
be within the range of values given in the standard operating conditions shown in the Specification table on the next page.
Sensitivity characteristics
Fig 3 shows the sensitivity characteristics curves of the SB-EN3
23
1
identification mark
) must
L
Fig 1d. Equivalent circuit
(typical data). Sensitivity characteristics of the FIS gas sensors are expressed by the relationship between the gas concentration and sensor signal. The sensor signal decreases with an increase of gas concentration based on a logarithmic function.
The sensitivity characteristics of the SB-EN3 is specified by the following parameters.
100 mesh SUS 316 gauze (double)
Sensing element Metal housing
(Nickel plated brass) Plastic base
Electrode pins (Ir
on-nickel alloy)
R
1 or
(-)
+
R
: sensor resistance
S
R
: heater resistance
H
R
S
H
or
+
2
3
(+)
R
L
V
C
大
V V R
R V
SPECIFICATIONS
Fig 2. Standar
V
H
cuit V
: Cir
C
: Heater Voltage
H
: Load Resistance
L
: Heater Resistance
H
RL:
oltage
Voltage acr
load resistance
d cir
R
oss
cuit
2
3
H
1
R
: Sensor Resistance
S
Operating conditions:
: 5 V DC
V
C
V
: 1.0 V DC (5 secs) -
H
0.3 V for detection
: Variable ( > 200
R
L
V
RL
Ω
)
+
+
1
Sensor signal change ratio
0.1
0.03
0.1 1 10
Fig 3. Sensitivity characteristics
Clean level
CH
SH
3
Concentration (ppm)
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SB-EN3
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Specifications
A. Standar
Symbol Parameter
d Operating conditions
Specification Conditions etc.
1.0 V ± 0.05V for 5
V
H
Heater voltage
seconds (warm up)
0.3V ± 0.02V (for detection)
V
C
R
L
R
H
I
H
P
H
P
S
Circuit voltage
Load resistance
Heater resistance
Heater current
Heater power consumption
Power dissipation of sensing element
Less than 5 V DC: Pin3 (+) - Pin 1 (-)
Variable
2.8 Ω ± 0.2 Ω at room temperature
140 mA (max) I
140 mW (max) P
Less than 10 mW
B. Environmental conditions
Symbol Parameter
Operating
Tao
temperature
Tas Storage temp
Specification Conditions etc.
o
C to 40 oC
-0
o
C to 70 oC
-10
RH Relative humidity Less than 95% RH
21% ± 1%
(O
)
2
Oxygen concentration
(Standard condition)
The sensitivity characteristics are influenced by the variation in oxygen concentration.
(> 200 Ω)
AC, DC or pulse
PS < 10 mW
= V
/ RH (typical value)
H
H
2
= V
/ R
H
=
(V
H
C
R
(typical value)
2
- V
)
RL
S
H
P
S
Recommended range
Absolute minimum level:
e than 18%
mor
Dimensions
4.5 ± 0.2
8.4 ± 0.3
1.0 ± 0.1
+0.3/ -0.5
0.7±0.1
5.0
0.9 ± 0.2
7.6 ± 0.2
2.54 2.54 ± 0.1 ± 0.1
1. Stainless steel mesh
2. Heater coil
3. Sensing element
4. Lead wire
5. Metal housing
6. Plastic base
7. Electrode pin
model
0.25 ± 0.03
EN3-00 841
sub-code
C. Sensitivity characteristics
Model SB-EN3-00 (tentative specifications)
Symbol
S/So
Standard T
Parameter Specification Conditions etc.
Sensitivity (gas/air)
est Conditions:
≤ 0.60
o
Temp: Humidity: 65% ± 5% (in clean air)
o
C ± 2
20
Pre-heating time: mor
Signal at 1 ppm of CH3SH
Signal in clean air
C
V
: 5.0 V ± 1%
C
: 1.0 V ± 1% x 5 secs
V
H
0.3V± 1% : 10 kΩ ± 5%
R
L
e than 48 hours
D. Mechanical characteristics
Items Conditions Specifications
equency: 100 cpm
V
ibration
Shock
Fr Vertical amplitude: 4 mm Duration: 1 hour
Acceleration: 100 G Number of impacts: 5 times
Should satisfy the specifications shown in the sensitivity characteristics.
0.8 ± 0.1
Scale: mm
E. Parts and Materials
No.
Parts Materials
Sensing element T
Lead wire Platinum
Heater coil Platinum
Plastic base PBT (Poly butylene ter
Stainless steel mesh SUS 316 (100 mesh, double)
Metal housing Nickel plated brass
Electrode pins
0.8 ± 0.10.8 ± 0.1
in dioxide (SnO
Iron-nickel alloy
production lot
2
ephthalate)
Please contact April, 2001
In the interest of continued product improvement, we reserve the right to change design features without prior notice.
1
) 2
3
4
5
6
7
SB14_EN3.fm : 4/May/01
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