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Specifications subject to change without notice.

 

1 of 8 

Catalog No. 11-808-639-01

 

 

Water Leak Detector 

Installation and Troubleshooting

 

#26268 

– 02

/28/2020 

 

Overview  

 

The Water Leak Detector is designed to sense the presence of water and alert a central monitoring system of the 
potentially destructive situation. Upon water detection, an alarm relay changes state, and a local red LED illuminates. 
The transmitter can be set for latching alarm or non-latching alarm with normally energized or de-energized operation. 
An optional remote water sensor is available for small inaccessible locations such as AHU pans or under floor water 
detection. 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

Figure 2:

  

Water Leak Detector (above) with 
Remote Spot Sensor (right) and 
10 ft. FEP cable 
Part #NSB-LDT4-RS10-BB 
 
 
 
Water Leak Detector (above) with 
Water Rope Sensor (below) 

Part #s: 

Figure 1:  

 

 

 

    

   

NSB-LDT4-RR10-BB (10 ft. rope) 

Water Leak Detector with   

 

 

   

NSB-LDT4-RR25-BB (25 ft. rope)

 

Internal Sensor Probe 

 

 

 

   

NSB-LDT4-RR50-BB (50 ft. rope)

 

Part #NSB-LDT4-PS-BB   

 

   

   

NSB-LDT4-RR100-BB (100 ft. rope) 

 

 

  
 

 

 

   

 
 
 
 
 

 

 
 

    

 

 

 

Summary of Contents for NSB-LDT4-PS-BB

Page 1: ...nsmitter can be set for latching alarm or non latching alarm with normally energized or de energized operation An optional remote water sensor is available for small inaccessible locations such as AHU pans or under floor water detection Figure 2 Water Leak Detector above with Remote Spot Sensor right and 10 ft FEP cable Part NSB LDT4 RS10 BB Water Leak Detector above with Water Rope Sensor below P...

Page 2: ...notice Water Leak Detector Installation and Troubleshooting 26268 02 28 2020 Figure 3 Water Leak Detector with Built in Sensor and a 5 Amp Relay in a System Diagram Side View Figure 4 Water Leak Detector with Remote Spot Sensor and a 5 Amp Relay in a System Diagram Side View ...

Page 3: ...tching local push button or power interrupt Sensor Reaction Responds to presence of water within 5 seconds Termination Terminal strip 4 10 terminals 12 24 AWG Agency RoHS UL94V 0 UV rated in Enclosure Set Up BB Sensor Adjustable depth from 063 to 84 1 16th default Remote Sensor Adjustable depth from 063 to 84 1 16th default Latching Latching version Stays Jumper energized after water has dried up ...

Page 4: ...sor down firmly Mount the detector enclosure in a visible location within cable length of the remote water sensor Alternatively a remote water sensor can be attached to the floor with screws Figure 8 Mount the detector enclosure in a more visible location within cable length of the remote water sensor Alternatively a rope water sensor can be laid on the floor or under pipes as shown in Figures 10 ...

Page 5: ... Pipe Sensor Mounting Figure 12 Vertical Pipe Sensor Mounting The following combinations of sensors can be used 1 Two rope sensors with a combined length of no more than 100 2 Two spot sensors with a combined length of no more than 75 3 One spot sensor with a maximum length of 25 and one rope sensor of no more than 50 Note Shielded or twisted pair wire cannot be used to extend the sensor wires Thi...

Page 6: ...M1 Alarm Contact 1 Common NO1 Alarm Contact 1 Normally Open to C1 when De energized GND NEU Power supply ground neutral V HOT Power supply input 24VAC 10 Not used for low current relay version SPST Form A Sensitivity Adjustment for 10 Remote Rope Sensor The unit s leak detection sensitivity is set at the Sensitivity Adjustment Potentiometer factory However for the remote rope sensors the sensitivi...

Page 7: ...th for alarm Operation Sequence When power is applied the green LED will illuminate and the unit will start to detect for water at the sensor probe When there is no detection of water normal condition the relays are not in an alarm state and the red LED remains off For units set up in the unsupervised relay mode the relays are de energized For units set up in the supervised relay mode default the ...

Page 8: ... no dirt or debris collected around the probes Dirt or debris around the probes may cause nuisance alarms in moist situations Change the service intervals depending on environmental conditions In very clean conditions the probe may never need maintenance Rope sensor may be wiped down with isopropyl alcohol warm soapy water on a cotton cloth or placed in a dishwasher Caution This unit is not intend...

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