This document describes a slack chain detection system from 4B Components that uses a high temperature sensor and speed relay. It can detect slack by monitoring a target bolt or steel flight on a conveyor chain. In option 1, the sensor detects a bolt installed on a paddle. In option 2, it detects a steel flight directly. In option 3, it waits to detect the flight if the chain slackens. When the target drops out of the sensor field, it stops sending pulses to change the speed relay contact state.

1. SlackSlack -- Brocken Chain DetectionBrocken Chain Detection
4B Components, Ltd.4B Components, Ltd.

2. WDA High Temperature Sensor
(HTAS1V34)
WDA Sensor
(WDA3V34C)

3. Speed Relay

4. Target or Bolt – 3/8” Diameter
1 – 3”
WDA - High Power
Reluctance Sensor
Sensitivity
Adjustment
LED
Speed Relay
Contacts change state
when sensor stops
detecting target or bolt.
Plastic Paddle
Steel Flight
OPTION 1
Sensor Detecting Bolt Installed on the Paddle
Under normal running conditions, the target bolt
passes through the sensor’s field and a pulse is sent
to the speed relay. If the chain becomes slack, the
target bolt will drop below the field and the pulses
will stop, causing the relay contact to change state.
LED

5. OPTION 2
Sensor Detecting Steel Flight
Under normal running conditions, the steel flight
passes through the sensor’s field and a pulse is
sent to the speed relay. If the chain becomes
slack, the steel flight will drop below the field and
the pulses will stop, causing the relay contact to
change state.
To Speed Relay
1 – 3”

6. OPTION 3
Sensor Waiting to Detect Steel Flight
Under normal running conditions, the steel flight
is out of the sensor’s field, so no pulses are sent
to the speed relay. If the chain becomes slack,
the steel flight comes into the sensor’s field and a
pulse is sent to the speed relay, causing it to
change state.
To Speed Relay
1”
1 – 3”

8. Thank You!Thank You!
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