Campbell-scientific AL200 ALERT2 Encoder, Modulator, and Sensor Interf Manuale Utente Scaricare il pdf (Pagina 17)

AL200 ALERT2 Encoder, Modulator, and Sensor Interface

• Set the Sensor Scan Interval – This is how often the AL200 will

power up and measure attached and enabled sensors. Value is

expressed in seconds.

• Set the SW12 Warm Up Time – This is the amount of time in

seconds that the AL200 will wait after powering up attached sensors

before making a measurement.

• Set the P1 Mode – Enable or disable the pulse count channel

depending on whether or not it is being used.

• Set the SE1 Mode – Set to Millivolt if using a sensor that has a single

ended voltage output. Set to Milliamp if sensor has a single ended

current output or 4-20 mA loop output.

• Set the SE1 ALERT2 Sensor ID – This is the sensor ID of the sensor

connected to the SE1 channel. See Appendix G, List of

Recommended Sensor IDs, for a list of recommended sensor ID

values.

• Set the SE1 Multiplier – This is a sensor specific value that along

with the SE1 Offset will be used to convert the analog output of a

sensor to an engineering unit. See Appendix H, Calculating

Multipliers and Offsets, for how to calculate multipliers and offsets.

• Set the SE1 Offset – This is a sensor specific value that along with the

SE1 Multiplier will be used to convert the analog output of a sensor to

an engineering unit. See Appendix H, Calculating Multipliers and

Offsets, for how to calculate multipliers and offsets.

• Set the SE1 Tx Change – This is the threshold which a calculated

value for the SE1 measurement must exceed in order to trigger a data

transmission.

• Set the C1 Mode – Set to Status to configure C1 to read a dry contact

(commonly a float switch). Set to SDI-12 to configure for use with an

SDI-12 type sensor.

• Set the C1 ALERT2 Sensor ID – This is the sensor ID of the sensor

connected to the C1 channel. See Appendix G, List of Recommended

Sensor IDs, for a list of recommended sensor ID values.

• Set the SDI-12 Command – This is the measurement command that

will be sent to the attached SDI-12 sensor. The format is xM!, where

x is the SDI-12 address.

• Set the SDI-12 Value to Send – If the attached SDI-12 sensor returns

more than one value, select which value will be used.

• Set the SDI-12 Multiplier – (1) – This is a sensor specific value that

along with the SDI-12 Offset will be used to convert the analog output

of a sensor to an engineering unit. See Appendix H, Calculating

Multipliers and Offsets, for how to calculate multipliers and offsets.

(Note that most SDI-12 sensors do not require a multiplier or offset

except for unit conversion.)

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Campbell-scientific AL200 ALERT2 Encoder, Modulator, and Sensor Interf Manuale Utente Pagina 17

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