Magnetrol 75 Series, Instruction Manual, Page: 1 / 14

SERIES 75
Liquid Level Switches
®
INSTRUCTION MANUAL AND REPLACEMENT PARTS
DESCRIPTION
Magnetrol’s Series 75 level switches are float operated
units suitable for use on clean liquid applications for level
alarm, pump control and safety shutdown functions.
OPERATING PRINCIPLE
A permanent magnet
①
is attached to a pivoted switch
actuator
②
. As the float/ displacer
③
rises following the liq-
uid level, it raises the attraction sleeve
④
into the field of the
magnet, which then snaps against the non-magnetic
enclosing tube
⑤
, actuating the switch. The enclosing tube
provides a static pressure boundary between the switch
mechanism and the process. On a falling level, an inconel
spring retracts the magnet, deactivating the switch.
①
②
③
④
⑤
Rising level Falling level
pivot
return spring
UNPACKING
Unpack the instrument carefully. Inspect all units for dam-
age. Report any concealed damage to carrier within 24
hours. Check the contents of the packing slip and purchase
order. Check and record the serial number for future refer-
ence when ordering parts.
AGENCY APPROVALS
Agency Approval
➀
CENELEC EEx d II C T6, explosion proof
EEx ia
II
C T6, intrinsically safe
➁
BASEEFA Ex d II C T6
CSA Non-Hazardous CSA Type 4X
➀
Class I , Div. 2, Groups B, C & D
Class
I
, Div. 1, Groups C & D
Class II , Div. 1, Groups E, F & G
Class I , Div. 1, Groups B, C & D
Class
II
, Div. 1, Groups E, F & G
FM Non-Hazardous NEMA 4X
➀
Class
I
, Div. 1, Groups C & D
Class II , Div. 1, Groups E, F & G
Class I , Div. 1, Groups B, C & D,
Class II , Div. 1, Groups E, F & G
SAA
➀
Ex d
II
C T6 (IP65)
➀
Not available with all switches; Consult factory for proper
model numbers.
➁
Consult factory for proper model numbers.