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Sensoray Model 618/619 Smart A/D 20 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. This is the only temperature sensor type that returns data in degrees

Fahrenheit. All other temperature sensors return data in degrees

Centigrade.

6. Gage specifications assume 4-wire bridge circuit, 120Ω minimum

impedance, 10V excitation applied by sensor channel.

7. 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:

Table 7: Sensor Specifications

Sensor Type Range Resolution

Accuracy

Thermocouple B 0 to +1820°C 0.1°C 3.3°C

C 0 to +1820°C 0.1°C 2.1°C

E -270 to +990°C 0.1°C 0.8°C

J -210 to +760°C 0.1°C 0.6°C

K -270 to +1360°C 0.1°C 1.0°C

N -270 to +1347°C 0.1°C 0.9°C

T -270 to +400°C 0.1°C 0.6°C

S 0 to +1760°C 0.1°C 3.0°C

R 0 to +1760°C 0.1°C 2.8°C

Thermistor Omega 44006 or 44031 -55°C to +145°C 0.01°C 0.05°C

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

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

-200 to +409°C 0.0125°C 0.2°C

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

-200 to +409°C 0.0125°C 0.2°C

Ni 120Ω, 0.380Ω/°F

-100 to +482°F 0.1°F 0.3°F

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

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

Gage

-500 to +500 mV 5µV

30µV

DC Voltage -5 to +5V

500µV 600µV

-5 to +5V 200µV 600µV

-500 to +500mV 20µV 40µV

-100 to +100mV 5µV 30µV

Current Loop

4 to 20mA 0.01% 0.08%

Resistance 0 to 400Ω 0.02Ω 0.04Ω

0 to 3KΩ 0.125Ω 0.25Ω

0 to 600KΩ 31Ω 130Ω

Disabled

Not Applicable — sensor removed from scan loop

Resolution

RatedLoad

210

×()RatedVoltageOut×

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

Resolution

100PSI

210

×()0.003V×

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

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