Brooks Instrument MT3809E - Manual (Page 24)

1-18
Section 1 Introduction
Models MT 3809 & 3819
Installation and Operation Manual
X-VA-MT3809-3819-eng
Part Number: 541B049AHG
September, 2008
1-8 Inductive Alarm Switches
A. Design
• 1 or 2 normally open inductive limit switches
• Optional intrinsically safe power supply/amplifier/relay unit
• For low or high limit signaling/switching
• Front adjustable
B. Description
One or 2 electronic limit switches can be installed in the indicator housing
to allow initiation of signaling or switching functions on a preset flow value.
The limit switch operates as a slot initiator that is inductively actuated by a
disc mounted on the pointer shaft. Any flow value can be used for setting
the limit value by sliding the initiator along the indicator scale. Minimum
setting distance between two limit switches is approximately 40% full scale.
The position of the initiator also serves to visually indicate the set value.
Settings can be adjusted by removing the indicator cover, loosening,
moving and retightening of the alarm indication needle, and replacement of
the indicator cover.
C. SPECIFICATIONS
EMC Directive 89/336/EEC: EN 50081, EN 50082 and EN 61326-1
Hazardous Location Classification
Enclosure: Type 4X/ IP65
Ambient Temperature: -22°F> Tamb < 150°F (-30°C > Tamb < 65°C)
Intrinsically Safe
United States and Canada UL Listed, E73889, Vol. 1, Sect. 15
Class I, II and III, Division 1, Groups A, B, C, D, E, F, and G; T4
Europe – KEMA 01ATEX1235 X
II 2 G EEx ia IIC T4
II 2 D T135
o C
Entity Parameters:
Ui=Vmax=30 Vdc; Ii=Imax=140 mA; Ci= 0.015 uF;
Li= 0 mH
Non-Incendive
United States and Canada UL Listed, E73889, Vol. 1, Sect. 15
Class I, II, III, Division 2, Groups A, B, C,D F, and G; T4
Europe – KEMA 01ATEX1236
II 3 G EEx nA II T4
II 3 D T135
o C