Input Impedance of the
Voltage Setpoint
The input impedance of the voltage
setpoint is 20 kOhm.
Voltage Drop at the 4–20 mA
Setpoint Input
The 4–20 mA input will drop 2.5 volts
at 20 mA. Input impedance is 125 ohms.
Lift-o Voltage of the 4–20 mA
Output Loops
The minimum lift-o voltage of the
4–20 mA output loops (flow, pres-
sure measurements) is 12 VDC. The
minimum lift-o voltage is the volt-
age required at the unit for proper
operation. The maximum load
resistance for a 24 VDC supply is
600 ohms and includes the resistance
of measurement devices and the
interconnecting cable.
Output Load Resistance Eects
Using a 24 VDC power supply, the
two 4–20 mA output loops (flow and
pressure) will experience no shift if
the load resistance is 0–600 ohms.
Reverse Polarity Protection
The flow controller is reverse polarity
protected; connecting the 24 VDC
power to the incorrect positive and
ground wires will not harm the unit.
To operate properly, the polarity must
be correct.
Over-Voltage on any Wire (DC)
The flow controller will withstand
the continuous application of 30 VDC
on any wire without compromising
the unit.
Over-Voltage on any Wire (AC)
The flow controller is not designed to
withstand the accidental application
110/220 VAC to any wire. Application
of AC voltage will damage the unit.
Short Protection
The flow controller will not be
damaged or compromised in any
way if any combination of wires
are shorted together.
Circuit Protection
Fuse the three input power lines to
each individual NT Integrated Flow
Controller, Model 6500. The three
lines are:
• 2-Red/Pin R, +24 VDC (main
power, 1.0 Amp nominal)
• 3-Orange/Pin M, Flow output,
+24 VDC supply
• 4-Yellow/Pin T, Pressure output,
+24 VDC supply
Use a 2 Amp rated, time lag fuse. A
single fuse can be used for all three
input power lines combined, or in-
dividually, as preferred. Place the
fusing on the input power lines to
the unit at the equipment electrical
enclosure to ensure that both the
wiring to the unit and the unit itself
are protected from any over-current
condition. Best practice is to locate
the fuse away from the typical liquid
exposure or harmful vapor areas.
Locating it within the electrical
enclosure shared by the power
supply enables accessibility for
troubleshooting or replacement.
NOTE: Do not power down the unit
until the homing cycle is complete.
NT INTEGRATED FLOW CONTROLLER, MODEL 6500
5Entegris, Inc. | User Guide
