Brooks Instrument QMBM - Manual (Page 33)

Section 2 Installation
2-7
Installation and Operation Manual
X-CM-QmB-eng
Part Number: 541B029AAG
June, 2011
QmB Series IP40, IP66, IP66XP
Power Supply (Pin 5 and Pin 9)
Both Mass Flow Meter and Controller models are connected via Pins 5
(+14 to +27 Vdc) and 9 (power supply common) on the customer
connector. See Section 5, Functional Specifications for current
requirement.
Valve Override (Pin 12; Controller models only)
To open or close the control valve independently of the setpoint signal
(e.g. for process reasons), Pin 12 is available to carry a valve override
signal. Leave floating (i.e. not connected) to allow for normal control
operation. Input impedence on Pin 12 is >50K ohms.
>5 Vdc @ Valve Open
0 Vdc @ Valve Closed
Density or Temperature Output (Pin 13 and Pin 10)
Pin 13 indicates the density or temperature, represented by a 4-20 mA
or 0-5 Vdc signal, proportional to density or temperature. The current
and voltage signals are returned via Pin 10. Maximum series resistance
on Pin 3 is 500 ohms when configured for 4-20 mA. Recommended load
on Pin 13 is >100K ohms when configured for 0-5 Vdc. Do not apply
power to Pin 13.
Alarm Output (Pin 3 and Pin 9)
Pin 3 indicates an alarm condition as an open drain FET configuration.
Maximum voltage is 30 Vdc, maximum current is 100 mA.
(See Figure 2-6 on page 2-8.)
PIN NO. FUNCTION Controller Meter
1 Setpoint Common • N/A
2 0 - 5 Vdc Flow Signal Output • •
3 Alarm Output • •
4 *4 - 20 mA Flow Signal Output • •
5 +14 Vdc to +27 Vdc Power Supply • •
6 not used
7 *4 - 20 mA Setpoint Input • N/A
8 0 - 5 Vdc Setpoint Input • N/A
9 Power Supply Common • •
10 Signal Output Common • •
11 +5 Vdc Reference Output • •
12 Valve Override Input • N/A
13 *4 - 20 mA or 0 - 5 Vdc Density or Temperature • •
14 not used
15 not used
Table 2-1 Electrical Interfacing for Quantim
* Do not apply power to these Pins.