System Sensor’s WFDEXP series is designed to handle extreme conditions. These

units are ideal for installation in hazardous locations classified as follows:

Class I, Groups B, C, D, Division 1 & 2

Class II, Groups E, F, G, Division 1 & 2

Class III, Division 1 & 2

Robust Construction.

The WFDEXP series consists of a rugged, NEMA 4

rated cast aluminum housing. Designed for both indoor and outdoor use, the

WFDEXP series operates across a wide temperature range, from 32ºF to 160ºF.

Inside, two sets of SPDT (Form C) synchronized switches are enclosed in a

rugged terminal block, to assure reliable performance.

Reliable Performance.

The WFDEXP series offers unique features that assure

greater operational reliability. By housing the spring mechanism separately

from the explosion environment, the sensitivity of the adjustment spring and

the detector is protected at all times. Adding to the WFDEXP’s reliability is its

sealed retard mechanism, which prevents contamination by dust and dirt when

the cover is removed.

Simplified Operation.

Like all System Sensor waterflow detectors, the WFDEXP

series is designed to ease installation. With its visible switch activation, the

WFDEXP’s retard timing can be verified, even during noisy conditions.

Product Overview

WFD40EXP

New WFD30-2EXP models install

in 2″ hole sizes

Designed and approved to operate

in hazardous locations

NEMA 4 enclosure rating

Sensitivity setting spring mechanism

located outside of explosion environment

Sealed retard mechanism

Visual switch activation

Synchronized activation circuit

Field-replaceable terminal block

and retard mechanism

Only one conduit entrance required

for hook-up

E200116

C169

3006195

44-00-E

Models Available

WFD20EXP

WFD40EXP

WFD25EXP

WFD50EXP

WFD30-2EXP

WFD60EXP

WFD35EXP

WFD80EXP

Replacement Parts

A77-01-02

TerminalBlock

A3008-00

RetardMechanism

WFDRK

HardwareKit

WFDEXP

Explosion Proof

Waterflow Detector

S p r i n k l e r

S y S t e m S

m o n i t o r i n g