User manual

905K Radio Telemetry Module User Manual
 ELPRO Technologies Pty Ltd 2010 Page 32
Voltage Input
Voltage inputs are connected to the AI+ and AI- connections. The maximum voltage signal that
can be measured is 10V.
The analog signal is set up for a 4-20mA signal in the factory. To use a voltage input, change the
jumpers (old version) or slide switch (new version)
inside the module:
1. Remove the lid from the unit.
2. With the unit oriented with the antenna
connector at the top of the unit, locate the
selector jumpers or switch at the bottom right
corner of the box.
3. New Version – Switch. When the switch is slid
to the right side (default), the analog input is set
for a mA signal; when slid to the left, it is set for
a voltage signal.
Old Version - Jumpers. Using long-nose
pliers, remove the two jumpers bridging the
left-hand and middle pins, and insert the
jumpers between the middle and right-hand
pins. When the jumpers are on the left side (default), the analog input is set for a mA signal;
when on the right side, it is set for a voltage signal. If used in a Class1 Division 2 Hazardous
Location, the PCB jumpers must be secured in place with glue or silicon.
Shielded cable is recommended for both mA and voltage analog input loops to minimise induced
noise and radio frequency interference (RFI). The shield of the cable must be connected to earth
at one end of the cable only. Additional surge protection is recommended in high electrical noise
environments, or if the analog signal cable runs for a long distance underground before
connecting to the 905K module.
mA
V
mA V
Old Version - Links
New Version - Switch