Brooks Instrument GT1000 - Manual (Page 15)

1-9
Section 1 Introduction Installation and Operation Manual
X-VA-GT1000-eng
Part Number: 541B078AAG
March, 2014
GT1000 Series
Inductive Alarms,
Alarm Contacts Meter Sizes 2 and 6
Inductive coils for high and/or low flow alarm may be mounted to the
instrument to create a highly sensitive, stable and accurate device for
signaling high or low flows or deviations from a controlled flow. The inductive
alarm can only be used in combination with 316 SS or Carboloy
® ball floats.
The alarm points may be adjusted over the entire flowmeter range and be
set so that any two contacts may be made to operate simultaneously. For
hazardous area applications Brooks can supply an approved Namur power
supply amplifier/relay unit to obtain an intrinsic safe current circuit. (Please
refer to Table 1-6)
Table 1-6 Data 10&15-14-N3 Inductive Coils
Single or Dual for Meter Sizes 2 and 6
Intrinsically Safe:
Division 1, Class I, Groups A,B,C,D,
Class II, Groups E,F,G, Class III.
Operating Fluid Temperature Limits
Reed Switch: Same as meter
Inductive: 167°F (75°C) max.
Alarm Hysteresis
8mm typical (0.32 in).
Alarm Accessories
Remotely mounted, switch isolator/power supplies are required for inductive
alarms and recommended for reed switch alarms. One or two single-pole,
double-throw (SPDT) relays are available with either 110 or 220 AC volt
units.
Optional Needle Valves
For flow rate control, needle valves may be externally piped to the inlet or
outlet side of the instrument via an adapter. Valves are available with
threaded or flanged connections. Note, solenoid valves should not be used
because this type of valve can cause pressure shocks which can damage
the glass tube.
Note: Flanged valves are supplied separately.