Scaling - Johnson Controls - LIT-12014272 - Valve - Venturi Valve

Venturi Air Valve with UVM1000 Installation Guide

Brand
Johnson Controls
Product name
Venturi Valve
Document type
Installation Guide
Document number
LIT-12014272
Revision date
2023-03-10
Language
English
The gain press sen and offset press sen fields can scale an optional external pressure sensor, so the sensors output voltage range converts to the appropriate pressure range on the UVM. The use of a pressure sensor as a DP monitor is active only when the use press sens as DP selection is active. The pressure sensor can be used to monitor the DP pressure across the valve and give a 0 CFM output voltage if the pressure falls below the value set in the no flow press field, typically 0.6 in. W.C. See Table 4 for more information on scaling details.
Note: When an analog pressure sensor is used with a voltage output connected to the sens_In pin, use the following scaling. The scaling is derived from : 0 V = 0 counts, 5 V = 4095 counts = x Press = (x – Offset) * Gain
  • Gain = ( ( Ph – Pl ) / ( Vh – Vl ) ) * ( 5 / 4095 )

  • Offset = ( 4095 / 5 ) * ( Vh – ( Ph * ( ( Vh – Vl ) / ( Ph – Pl ) ) )

  • Where Vh is the sensor voltage at the high-pressure Ph, and Vl is the low voltage at the low-pressure Pl.