4-7Lasair® Pro Aerosol Particle Counter Operations Manual
Chapter 4 : Connections
Figure 4-2. ENVIRONMENTAL tab, IN/OUT
6. Each analog input can have a dierent value of the Scale and Oset values. These
values are determined by the range of the sensors that are being used.
# A selection box to enable or disable the analog input.
NAME Can be changed to name of the sensor such as Temperature or Humidity.
UNITS Can be used to identify the units of measure related to the 4-20 mA value, such
as degrees C or percent (%) humidity.
MIN Is the minimum value of the measurement device. For example, if the lowest
value of a temperature probe is 32, the value of 32 would be entered into this
field.
MAX Is the maximum value of the measurement device. For example, if the highest
value of relative humidity probe is 100%, the value of 100 would be entered
into this field.
As an example, we will be setting up a TRH accessory for the Lasair Pro particle counter
with the following specifications:
• Temperature range: 32 – 122 °F
• Relative humidity range: 0 – 100%
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