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3.6.8 Analog wiring
devices that can cause RF interference to the instrument such as microwave ovens, arc
welders, motors, and other industrial machinery. Use lower data rates when necessary to
increase the operating range. For good margin, the instrument should be able to
communicate at twice the required distance.
Notes
•
The antenna gain must not exceed 5 db.
•
The antenna must be installed such that 20 cm is maintained between the antenna
and users.
•
The instrument module may not be co-located with any other transmitter or antenna.
The data rates available are not necessarily the data throughput rate. When using
security encryption or increased distance between the instrument and the network access
point the data throughput also lowers.
An RF site survey should be conducted to identify potential problems before installation.
The only way to determine the actual range and data rate is to test the unit in the
environment.
Counters with the analog output option send a 4 to 20 mA signal that is proportional to
the number of counts in a given sampling time. A data acquisition system receives the
signal. The maximum number of counts that correspond to the 20 mA signal is set using
the setup utility program. An analog unit can have 2 or 4 channel sizes. If the power is set
to off, then all channels send an output that is < 2 mA. If a channel is disabled in the
counter setup menu the channel output is < 2 mA. The channel output is < 2 mA if there
is a sensor-calibration failure or flow failure and the instrument has a flow monitor
installed.
Analog units cannot be used in network configuration. Refer to
install a particle counter with the analog output.
Figure 15 Terminal assignments—analog output
Table 6 Terminal assignments—analog output
Terminal
1
2
3
4
Installation
Figure 15
and
Assignment
24 VDC external loop power source
Channel 1 loop out
Channel 2 loop out
Channel 3 loop out
Table 6
to
23
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