Brooks Instrument QMBM - Manual (Page 32)

Section 2 Installation
2-6
Installation and Operation Manual
X-CM-QmB-eng
Part Number: 541B029AAG
June, 2011
QmB Series IP40, IP66, IP66XP
2-9 Electrical Interfacing
Meter and Controller
Flow Output (Pins 2, 4 and 10)
Flow Output configuration is a factory selected option.
Each Quantim instrument is calibrated as either 0-5 Vdc
or 4-20 mA at the factory as specified when ordering.
Pin 2 indicates the flow rate, represented by a 0-5 Vdc signal
proportional to flow, if so configured. Recommended load on Pin 2 is
>1K ohm. Pin 4 indicates the flow rate, represented by a 4-20 mA signal
current proportional to flow, if so configured. Maximum series
resistance on Pin 4 is 500 ohms. Do not apply power to Pin 4. The
current and voltage signals are returned via Pin10.
Analog Setpoint Input (Pins 7, 8 and 1; Controller models only)
Signal Input configuration is a factory selected option.
The Mass Flow Controller can be used either with a current or
voltage setpoint as configured when ordered. If configured for current
(4-20 mA) setpoint, connect the setpoint signal to Pin 7 and the setpoint
return signal to Pin 1. Input impedence on Pin 7 is 250 ohms. Do not
apply power to Pin 7. If configured for voltage (0-5 Vdc) setpoint,
connect the setpoint signal to Pin 8 and the setpoint return to Pin 1.
Input impedence to Pin 8 is 200K ohms.
Figure 2-4 Vertical Flow Up Installation
Vertical Mounting
If the Brooks Quantim is installed in a vertical orientation, for use in a liquid
application liquid should flow upwards through the instrument to help
minimize errors due to entrapped gas (See Figure 2-4). For gas flow
vertical orientation, flow up or down is acceptable.