Rockwell Automation 1414-IPZxxxxx_CPZxxxxx_CPDxxxxx Differential Air Pressure Transmitter - Manual (Page 5)

Differential Air-pressure Transmitter 5
Publication 1414-IN011B-EN-P - July 2010
The analog output signal is available on the OUT terminal. This signal is jumper selectable for
either a voltage output or a standard loop-powered 4…20 mA output signal type. When voltage
mode is selected, either 0…5V DC or 0…10V DC can also be selected. These options are
indicated on the device circuit board. The analog output signal is typically connected directly to
the Building Automation System (B.A.S.) and used as a control parameter or for logging
purposes.
For voltage type output signal the device has a minimum load that it is able to drive, similarly for
current type output signal the device has a maximum load that it is able to drive with a particular
power supply voltage. Observe and follow these ratings in the Specification section or inaccurate
reading may result.
The 4…20 mA output signal can easily be converted to a 1…5V DC signal for controllers
accepting this type of input. Simply insert a 250
Ω (0.1% is best) resistor between the ‘+’ and ‘-’
inputs of the controller. This will convert the 4…20 mA signal to the desired 1…5V DC.
Pneumatic Connections
The two pressure ports on the end of the enclosure are labeled High and Low. The output signal
reads a positive value when the port pressure is higher on the High port than the Low port so
ensure these ports are connected correctly.
Use 0.170 in. I.D. flexible tubing for the High and Low pressure connections. Arrange the tubing
to minimize stress on the connections and ensure there are no kinks in the tubing. For most
accurate measurements, do not leave the Low port open to the atmosphere, run a return line
from the Low port to the vicinity of the point being measured.
Ensure the tubing to be used is clean and do not allow material to fall into the pressure ports as
contamination could damage the sensor.
When removing tubing use care to avoid breaking the ports. In some cases it is better to cut the
tubing off rather than pulling it off but be careful not to cut the fitting or an air leak may occur.
Differential Air-pressure Transmitter Configuration
The transmitter is configured with push-on type jumpers on the circuit board as shown on the
Power Supply drawing. These jumpers are used to select the output signal type and the input
pressure range.
The module is factory configured to operate in the 4…20 mA output mode. You can change the
voltage mode by moving the three jumpers from the positions marked Current to the positions
marked Voltage. Before moving these jumpers, study the current jumper position and then move
the jumpers to the new position. If these jumpers are rotated 90 degrees and installed incorrectly
the product will not work and device damage may occur.
Once the output mode is changed to voltage, the output scale may be changed to either
0…5V DC or 0…10V DC. This is done by moving the single jumper to the 0…5V or 0…10V
position.