Sensor specifications, 2 sensor specifications – Sensoray 118 User Manual
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Sensoray Model 118 Smart A/D™ Instruction Manual
36
Specifications
9.2 Sensor Specifications
Notes
1.
Measurement resolution and accuracy is specified for the default (versus
high-speed) measurement mode. Derate resolution and accuracy by 75%
when using the high-speed measurement mode.
2.
Channels configured for 4-20mA current loops return data values
representing a percentage of full-scale current (4mA= 0%,
20mA=100%). For example, a 12mA current would produce the data
value 50.0, indicating 50% of full-scale.
3.
This is the default sensor type after a board reset. It is provided for
back-compatibility with earlier Sensoray Smart A/D products. Use of
this type is not recommended for new designs, as higher resolution is
available on the 5V, 200uV resolution range.
4.
Declaring a channel’s sensor type as Disabled removes the channel from
the scan loop. Data values returned from disabled channels are
indeterminate and should be ignored.
5.
Gage specifications assume 4-wire bridge circuit, 120
Ω
minimum
impedance, 10V excitation applied by sensor channel.
6.
Use the following function to express gage measurement resolution in
load units:
For example, take the case of a pressure gage that is rated at 3mV/V at
100 PSI full scale. The Smart A/D would be able to resolve a load to:
7.
SDC is the Sensor Definition Code that is used by the SetSensorType
command to declare a channel’s sensor type. See Section 6.2.1 for
details.
Table 9: Sensor Specifications
Sensor Type
Measurement
SDC
7
(hex)
Range
Resolution
1
Accuracy
1
Thermocouple
B
0 to +1820°C
0.1°C
3.3°C
24
C
0 to +1820°C
0.1°C
2.1°C
23
E
-270 to +990°C
0.1°C
0.8°C
01
J
-210 to +760°C
0.1°C
0.6°C
1B
K
-270 to +1360°C
0.1°C
1.0°C
1C
N
-270 to +1347°C
0.1°C
0.9°C
22
T
-270 to +400°C
0.1°C
0.6°C
1D
S
0 to +1760°C
0.1°C
3.0°C
1E
R
0 to +1760°C
0.1°C
2.8°C
1F
Thermistor
Omega 44006 or 44031
-55°C to +145°C
0.01°C
0.05°C
1A
RTD
Cu 10
Ω
, 0.0367
Ω
/°C
0 to +119°C
0.1°C
0.6°C
2C
Pt 100
Ω
, 0.385
Ω
/°C
-200 to +800°C
0.05°C
0.2°C
18
Pt 100
Ω
, 0.392
Ω
/°C
-200 to +800°C
0.05°C
0.2°C
19
Ni 200
Ω
, 1.10
Ω
/°C
-58.9 to +151.6°C
0.02°C
0.07°C
28
Ni 1K
Ω
, 5.60
Ω
/°C
-50.0 to +129°C
0.025°C
0.08°C
29
Gage
5
-500 to +500 mV
5µV
6
30µV
0F
DC Voltage
-5 to +5V
3
500µV
600µV
00
-5 to +5V
200µV
600µV
15
-500 to +500mV
20µV
40µV
16
-100 to +100mV
5µV
30µV
17
Current Loop
2
4 to 20mA
0.01%
0.08%
11
Resistance
0 to 400
Ω
0.02
Ω
0.04
Ω
0A
0 to 3K
Ω
0.125
Ω
0.25
Ω
14
0 to 600K
Ω
31
Ω
130
Ω
20
Disabled
4
Not Applicable — sensor removed from scan loop
13
Resolution
RatedLoad
2
10
6
×
(
)
RatedVoltageOut
×
---------------------------------------------------------------------------
=
Resolution
100PSI
2
10
6
×
(
)
0.003V
×
----------------------------------------------
0.017PSI
=
=