Black Box ServSensor JR EME102A, Руководство пользователя, Страница: 36 / 135

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ServSensor JR
34
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Measurement rate - multiple readings every second
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Up to 2 DC voltage sensors per ServSensor JR
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Full Autosense including disconnect alarm
Configuring the DC voltage sensor
Since all of BLACK BOX's intelligent sensors are configured similarly
not every field is described below. The descriptions below describe the
fields that are special to the DC voltage sensor.
For a general description about configuring all sensors including
information regarding common configuration parameters please see the
Installing and Configuring Sensors page.
Current Reading: The percentage of DC voltage is displayed in this
field. This is a read-only field. This is an integer SNMP OID field. This
value can be polled via SNMP and the data can be used to graph the
airflow. The values range is from 0 to 100 %. This value depends on
the jumper settings in the DC Voltage sensor box. If 10V is selected,
then 0 to 10VDC is mapped to 0 to 100 %, if 20V is selected, then 0 to
20VDC is mapped to 0 to 100%.
A/D base in 1/10-volt increments: This is the minimum voltage that
the DC Voltage sensor will output. This value in conjunction with the
maximum voltage from the sensor is used to determine the percentage
of the sensor.
A/D max, Range 0-40, 40 is 4 volts: This is the maximum voltage that
the DC Voltage sensor will output. This value in conjunction with the
minimum voltage from the sensor is used to determine the percentage
of the sensor. So if the input jumper on the DC Voltage sensor is set to
60, and the input voltage is also 60 volts then the DC Voltage sensor
will output 4 volts to the ServSensor JR and this is 100% of full scale.
Status: The status is formed by comparing the percentage of full scale
to the high and low thresholds. So if the A/D base is set to 0(This is 0
volts) and the A/D max is set to 40(this is 4 volts) then if the actual
voltage from the DC Voltage sensor going into the ServSensor JR is 2