Brooks Instrument GT1000 - Manual (Page 12)

1-6
Section 1 Introduction
GT1000 Series
Installation and Operation Manual
X-VA-GT1000-eng
Part Number: 541B078AAG
March, 2014
1-4 Optional Equipment - Alarms & Valves
GT1000 Alarm Contacts Meter Sizes 7 to 13
The Brooks reed switch alarm is a normally open, latching switch used in
conjunction with the GT1000 glass tube flow meter for signaling high and/or low
flow or a deviation from a flow setting.
A magnet embedded and sealed in the float actuates the alarm switch. The reed
switch is mounted adjacent to the flow tube and is easily adjustable over the
entire flow range of the instrument.
The sealed reed switch consists of a biasing magnet and hermetically sealed
reed switch, which is insulated to prevent damage from mild shock and normal
pipe vibration. The contact rating of the switch is very low (0.5A).
An external relay is recommended for secure operation. Plus the external relay
can be configured to operate as a normally open or normally closed state which
provides totally flexibilty of operation.
Alarm Certifications
Reed Switch Alarms,
Single or dual for meter sizes 7-13
Electrical Classification
Non Incendive:
Maximum Voltage:
30 Vdc
Maximum Current: 250 mA
Maximum Contact Rating: 3 Watts
US and Canada E73889
NI Class I, Div 2, Groups A, B, C and D:
Class II, Groups F and G T6
per UL 1604, Third Edition
Environmental rating: Type 4X
Intrinsically Safe:
Entity parameters:
Vmax = 30Vdc, Imax = 100mA, Ci=0, Li=0.
US and Canada E73889
IS Class I, II, III, Div 1, Groups A, thru G, T6
per UL 913, Sixth Edition
Environmental rating: Type 4X