Measurement and Control Peripherals
 |
The SDMs are a group of addressable peripherals that expand the datalogger's
output and measurement capabilities. The datalogger controls the SDM output device by storing
a value in a memory location which is then used by the SDM to set a voltage or relay. Measurement
devices store data from sensors which are regularly read into the datalogger through a control
port.
|
 |
Serial Data Interfaces are used to connect "smart sensors", specifically those with
serial communications capability, to a datalogger. The datalogger processes and stores data from
the sensor and issues commands to the sensor.
|
 |
Multiplexers allow our
CR800,
CR1000,
CR3000,
CR5000 and
CR9000 dataloggers to measure more sensors. The
number of analog inputs is increased by sequentially multiplexing sensor leads into
"common" leads. The individual common leads are connected to datalogger analog inputs,
excitation channels, or ground as required by the sensor. The datalogger controls the multiplexer
using two control ports or one control port and one excitation channel.
|
 |
Relays can provide power directly to external devices that have modest power requirements, such
as the small fans used in our Bowen ratio systems.
Alternatively, these relay drivers can provide control signals to heavy-duty external relays
that in turn can control power to heavy-duty, high-power equipment such as ventilation fans,
aquacultural aerators, refrigeration units, or other electrically powered machinery.
|
 |
These simple modules are small peripherals that provide completion resistors for resistive
bridge measurements, voltage dividers, and precision current shunts. The modules attach
directly to the datalogger's input terminals. Each input module provides circuitry to connect
one sensor, except for the voltage dividers which can connect up to two single-ended sensors.
|
|
Phone: (780) 454 2505
