Specifications

SmartReader Plus Data Loggers
51
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2. Determine what sensors, transducers or transmitters you need to do the job (if not
already present). Compatible transducers for monitoring temperature, relative humidity,
pressure, speed, and many more variables are available through a wide variety of
vendors (see Selecting Transducers and Transmitters).
3. Modify the channels externally (using resistors), if required, for maximum resolution (see
Customizing Input Ranges).
4. Write a Custom Equation to convert the internal A/D converter readings from the
transducer or circuit you want to monitor into the proper engineering units required (for
example, a 4-20mA signal representing 0 to 10,000 l/min). For help writing these
equations refer to the TrendReader guide.
5. Decide how you are going to power your transducers (if required). You can, for example,
use a standard power supply and create a circuit like that shown in Figure 7-2.
Figure 7-2: Transducer Power Supply Connection
6. Connect your transducers or transmitters and check operation by observing the Realtime
value displayed by TrendReader software. If you can, try to exercise your transducers
(make them change their output) to ensure that everything works. If it does, then you are
ready to place your assembly in the field to start logging.
Channel
Description
Equation
0
Internal Temperature
45
1
25 mA
6
2
25 mA
6
3
200 mV
19
4
2.5 V
7
5
5 V
18
6
5 V
18
7
10 V
17