Digital Input to Pressure Output

Product Data

ACI/PTS Series

The ACI/PTS3.3 converts two digital signals (increase/decrease), into a proportional, pneumatic signal of 0 to 15 psi with 255 steps of resolution. The digital inputs can be either a relay contact closure, transistor, or triac. Some of the most common applications for the ACI/PTS are:

              ·         VAV Damper Motor Control
       ·         Compressor Staging
       ·         Any Pneumatic Actuator Control
       ·         3-Way Mixing Valve Actuator Control

 The pneumatic output will increase when the up input is on, or decrease when the down input is on at the selected rate of change. Not only does the ACI/PTS3.2 have LED indication for both the Increase and Decrease inputs, but it also contains a manual override potentiometer.  The PTS3.2 has a 0 to 5 VDC signal, which may be used to monitor the overall branch line pressure.  A regulated 24VDC or 22 to 28 VAC supply voltage is required with a maximum supply pressure of 25 psi.

The PTS3.3 maintains the last commanded pressure since it has a closed loop electronic design.  This means that as soon as the power fails both the main and branch valves close holding the pressure at the last output as long as the branch line does not have a leak. Another version is the ACI/PTS3.3FS or ACI/PTS3.3S.  The only difference in the PTS3.3FS is that it is designed with (2) Normally Open valves so that the branch line pressure output drops to 0 psi on power loss.  The ACI/PTS3.3S is a single valve version of the PTS3.3FS.  This unit has an orifice that will allow the pressure to bleed to 0 psi upon power loss.

Connections are made with barbed fittings for 1/4” O.D. (1/8” I.D.) polyethylene or PVC tubing.  For local gauge monitoring of branch pressure, a 1/8”-27 FNPT port is incorporated in the aluminum manifold.

The ACI/PTS4 has all of the same features as the ACI/PTS3.3 except for the 0 to 5 VDC feedback signal.  Please contact ACI for more information regarding the ACI/PTS4.