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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, 120Ω 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

(hex)

Range Resolution

Accuracy

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 10Ω, 0.0367Ω/°C 0 to +119°C 0.1°C 0.6°C 2C

Pt 100Ω, 0.385Ω/°C -200 to +800°C 0.05°C 0.2°C 18

Pt 100Ω, 0.392Ω/°C -200 to +800°C 0.05°C 0.2°C 19

Ni 200Ω, 1.10Ω/°C -58.9 to +151.6°C 0.02°C 0.07°C 28

Ni 1KΩ, 5.60Ω/°C -50.0 to +129°C 0.025°C 0.08°C 29

Gage

-500 to +500 mV 5µV

30µV 0F

DC Voltage -5 to +5V

500µV 600µV 00

-5 to +5V 200µV 600µV 15

-500 to +500mV 20µV 40µV 16

-100 to +100mV 5µV 30µV 17

Current Loop

4 to 20mA 0.01% 0.08% 11

Resistance 0 to 400Ω 0.02Ω 0.04Ω 0A

0 to 3KΩ 0.125Ω 0.25Ω 14

0 to 600KΩ 31Ω 130Ω 20

Disabled

Not Applicable — sensor removed from scan loop 13

Resolution

RatedLoad

210

×()RatedVoltageOut×

---------------------------------------------------------------------------=

Resolution

100PSI

210

×()

0.003

V×

----------------------------------------------0.017PSI==

1 2 ... 33 34 35 36 37 38

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