Installing The Btl; Application 2: Fill Level Measurement In Zone; Preparing For Installation; Installing The Position Measuring System - Balluff BTL7-P511-M Serie Manual De Instrucciones

BTL7-P511-M _ _ _ _ -J-DEXC-TA12
Magnetostrictive Linear Position Sensor – Rod Style
4
Installation and connection (continued)
4.2.3

Installing the BTL

NOTICE
Interference in function
Improper installation can compromise the function of the
BTL and result in increased wear.
► The mounting surface of the BTL must make full
contact with the supporting surface.
► The bore must be perfectly sealed (O-ring/flat seal).
► Check the suitability of the O-ring (Viton) for the
specific application.
► If installed in a hydraulic cylinder outside of zone 0,
the magnet should not make contact with the rod.
Protect the rod from damage and wear.
1. Unscrew and remove housing cover.
2. For secure fastening, tighten the BTL with hexagon
socket screws M6x45 A2 or 1/4"-20 x 1-3/4" at all 6
mounting holes (torque 3.5 Nm or 2.6 ft ∙ lb).
3. Connect wiring
(see Electrical connection on page 14).
4. Re-install the housing cover and tighten to 33...40 Nm
(25...30 ft ∙ lb). Tighten secondary retaining screws
(ATEX).
► Install the magnet (Accessories).
► From 500 mm nominal length: support the rod
and tighten it at the end if necessary.
12 english
Ignition protection "d"
Flameproof enclosure
4.3 Application 2: fill level measurement in zone 0
(with float, according to Section 8.1)
4.3.1

Preparing for installation

Installation note: We recommend non-magnetizable
material for mounting the BTL and float.
Avoid magnetic field interference at the screw-in thread,
e.g. by the weld seam at the threaded flange!
Install the BTL in such a manner that only the rod extends
into the explosive area of zone 0 and the body and
electronics remain behind a separating wall in the explosive
area of zone 1.
The spacer ensures that the float does not move into the
damping zone in the bottom end of the rod.
The depth of the mounting hole must be at least 25 mm
(see Fig. 4-4).
4.3.2

Installing the position measuring system

Installing the float
Important notes
– Only the floats listed under Accessories may
be used as magnets in zone 0 (see
section 8.1).
– Design measures ensure that the floats are
electrically connected with the rod in any
position. The specified installation position
must be observed!
– Only use the cotter pin once!
1. Install the float (accessory) taking the orientation into
account (raised markings on top, see section 8.1).
2. Secure the float using the cotter pin (included in the
scope of delivery of the float), without placing any
mechanical loads on the rod. Insert the cotter pin
through the hole and hold it at the eye with a pair of
pliers. With a second pair of pliers, bend the straight
ends of the cotter pin around the rod one after another.