The pulse sensor bridge has four connectors that can be used to monitor up to four utility meters with pulse output (power, water, and/or gas).
Different meters have different ways to expose pulse counts. The Senseware Pulse Sensor Bridge can support different configurations that can be set up through the configuration page.
1. The meter is a simple dry contact
In this case, the meter consists of a dry contact relay that will successively relay the 3.3V provided by the pulse sensor bridge and then open the relay. Connect one the + connectors of the bridge to the + connector of the meter and the corresponding - connector of the bridge to the - connector of the meter. The bridge will be operating in this mode if 'Bridge Voltage Source' is selected on the configuration page.
2. The meter is providing its own pulse signal
In this case, the meter is providing its own positive pulse voltage. Connect the pulse signal from the meter to one of the - connectors on the bridge and the corresponding + connector to the ground of the meter. The bridge will be operating in this mode if 'External Voltage Source' is selected on the configuration page.
Note: if the voltage of the pulse signal provided by the meter is above 5V, please contact Senseware before connecting the meter as it can damage the sensor bridge.
Note: it is not recommended to use a Node on battery if you are using a pulse sensor bridge in this mode.
3. The pulse meter is switching to ground
In this case, the meter is providing a pulse signal switching between open circuit and ground. Connect the pulse signal from the meter to one of the - connectors on the bridge and the corresponding + connector to the ground of the meter. The bridge will be operating in this mode if 'Pulse to ground' is selected on the configuration page.
Once the pulse sensor bridge is properly wired, connect it to an available port on the node and power the node. The LED associated with each meter will turn on if the dry contact is closed, and then turn off once the dry contact is open. The pulse sensor bridge will count every time the connection goes from open to close.
Power: 3.3V DC from node or gateway via micro-USB connector
Inputs: 4 Pulse signals (provides 3.3V DC to meter)
Bridge Output: 4 x 32 bits registers representing the number of pulses
Size (inches): 2.1 x 2.1 x 0.4
Weight (ounces): 0.8
Note: If you have a pulse bridge that has four separate connectors as depicted on the image below, the only mode supported is 'Bridge Voltage Source'.