Thermal Mass Flow Meter Wiring and Connection Instructions
4-20 Internal and External Wiring guides for 4-20, as well as 1-5 VDC across a 250 Ohm Resistor, the 0-5 VDC hookup, and the Pulse Counter connections.
See Video Instructions here
Two page Wiring Diagram below, download here
These diagrams give the details of the circuitry behind the connections you need to use the Mass Flow Meter. Below these are graphical and photographs showing the hookups for those who prefer photos.
Internal 4-20 Configuration
Download a PDF of the images below here
Wiring for 4-20 using the Internal 24 VDC power supply from the Mass Flow Meter. The 0-5 VDC is also shown with the Orange (PLUS) and White (MINUS) wire.
Wiring for 4-20 using the Internal 24 VDC power supply from the Mass Flow Meter. Be sure to place the jumper to the INT position. This is the easiest method of outputting 4-20 mA for 0 to Full Scale. DO NOT USE this method if you are using a PLC or device that has POWER. This method can ve easily read with a DVM configured to read current as shown above. The advantage of this method is near immunity to noise. Frequently users use 4-20 mA to drive the current across a 250 Ohm Resistor and simply measure 1 to 5 VDC for 0 to Full Scale.
Internal 4-20 for driving 1 to 5 VDC at PLC or measuring device. This is what is commonly used when the user has a voltage reading device or a pure current reading device.
EXTERNAL 4-20 Configuration
Wiring for 4-20 using using your EXTERNAL 12 - 36 VDC power supply. The 0-5 VDC is also shown with the Orange (PLUS) and White (MINUS) wire.
Wiring for 4-20 using your External 12-36 VDC power supply from your device Be sure to place the jumper to the EXT position. USE this method if you are using a PLC or device that has POWER. The advantage of this method is near immunity to noise. Frequently users use 4-20 mA to drive the current across a 250 Ohm Resistor and simply measure 1 to 5 VDC for 0 to Full Scale.
External 4-20 for driving 1 to 5 VDC at PLC or measuring device. This is what is commonly used when the user has a voltage reading device.