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D250-02-00 

I56-2814-003R

B501BhT-2
Temporal Tone Sounder Base

inSTaLLaTiOn and mainTenanCe inSTrUCTiOnS

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: 630-377-6495

www.systemsensor.com

Before installing

Please  read  the  System  Smoke  Detector  Application  Guide, 
which provides detailed information on sensor spacing. place-
ment, zoning, wiring, and special applications. Copies of this 
manual are available from System Sensor. NFPA 72 and NEMA 
guidelines should be observed.

NOTICE:

 This manual should be left with the owner/user of 

this equipment.

IMPORTANT:

 The detector used with this base must be tested 

and  maintained  regularly  following  NFPA  72  requirements. 
The detector should be cleaned at least once a year.

General description

The B501BHT-2 sounder base is used with System Sensor 200 
Series sensor heads. Refer to the appropriate manual for more 
information on sensors.
The B501BHT-2 incorporates the distinctive three-pulse tempo-
ral pattern fire alarm evacuation signal now required by NFPA 
72 for commercial and residential applications.
The sounder base is intended for use with intelligent systems. 
Refer to the panel manual for the maximum allowable num-
ber of units per loop. The sounder base requires an external 
24VDC supply with reverse polarity capability or a relay mod-
ule configured to reverse the power as in 

Figure 5

. The con-

nections for the external supply (terminals 1 and 2) and the 
communication loop (terminals 3 and 4) are isolated to pre-
vent electrical interaction between them.
A loop of horns can be made to sound by reversing the polar-
ity of the external supply when configured as in 

Figure 4

 and 

5

. When configured as in 

Figure 5

, a loop of horns can also be 

made to sound by turning on the Intelligent Relay Module.

Specifications

Base Diameter: 

6.0 inches (15.2 cm)

Base Height (less sensor): 

2.3 inches (5.9 cm)

Weight: 

.32 lb. (145 gm)

Operating Temperature Range: 

32° to 120°F (0° to 49°C)

Operating Humidity Range: 

10% to 93% Relative Humidity

Electrical Ratings

External Supply Voltage: 

17 to 32 VDC

Standby Current: 

1.0 mA maximum

Alarm Current: 

15 mA maximum

Maximum Ripple Voltage: 

10% of supply voltage

Start-up Capacitance: 

200 µF

Communication/Initiating Loop Supply

Current Draw from Remote Output 
of Sensor to turn on Horn: 

600 µA maximum

Sound Output:  

Greater  than  90  dBA  measured  in  anechoic  room  at  10  feet,  24  volts.  85  dBA 

 

minimum measured in UL reverberant room.

Sounder Delay Time: 

0.75 to 5.7 sec

NOTE:

 When not used as a supplementary evacuation system, 

the external 24 VDC supply shall be treated as a component of 
the main power supply system and shall fall under the require-
ments of the main power supply system per NFPA 72.

B501BhT-2 Terminals

No.    Function

1  External Supply Positive (+)
2  External Supply Negative (–)
3  Negative (–) Comm. Line In and Out
4  Positive (+) Comm. Line In and Out
5  Sounder Base Interconnect
Terminals 3 and 4 are used for the communication circuit.

mounting

Mount the B501BHT-2 directly to an electrical box, using the 
mounting kit, supplied (see 

Figure 2

).

The sounder base is 1.1-inches deep. Electrical boxes must be 
4-inches square by at least 1

1

2

 inches deep - 2

1

8

 inches is rec-

ommended.

NOTE: 

A maximum space of 

1

8

 inch from the outside edge of 

the electrical box to the inside edge of the drywall or ceiling 
tile is allowable.

Wiring Guidelines

All wiring must be installed in compliance with the National 
Electrical  Code  and  the  local  codes  having  jurisdiction  and 
must not be of such length or wire size which would cause 
the base to operate outside of its published specifications. The 
conductors used to connect smoke sensors to control panels 
and  accessory  devices  should  be  color  coded  to  reduce  the 
likelihood of wiring errors. Improper connections can prevent 
a system from responding properly in the event of a fire.

I56-28

14-00

3R

Summary of Contents for B501BHT-2

Page 1: ...es 15 2 cm Base Height less sensor 2 3 inches 5 9 cm Weight 32 lb 145 gm Operating Temperature Range 32 to 120 F 0 to 49 C Operating Humidity Range 10 to 93 Relative Humidity Electrical Ratings External Supply Voltage 17 to 32 VDC Standby Current 1 0 mA maximum Alarm Current 15 mA maximum Maximum Ripple Voltage 10 of supply voltage Start up Capacitance 200 µF Communication Initiating Loop Supply C...

Page 2: ... and bases must be tested after installation and as an inte gral part of periodic maintenance Test the B501BHT 2 as follows NOTE Before testing notify the proper authorities that the smoke sensor system is undergoing maintenance and there fore will be temporarily out of service Disable the system un dergoing maintenance to prevent unwanted alarms 1 If configured as in Figure 4 or 5 reverse the pol...

Page 3: ...for primary alarm signaling C0474 05 UL LISTED COMPATIBLE CONTROL PANEL INTELLIGENT RELAY MODULE FIRST SOUNDER BASE POWER POWER LAST SOUNDER BASE SLC SLC UL LISTED EOL RELAY 24V UL LISTED EOL RESISTOR 47k UL LISTED 24V SUPPLY SLC THIS IS A STANDARD RELAY MODULE CONFIGURED TO REVERSE THE POWER OPTIONAL SOUNDER INTERCONNECT SLC SLC SUP SUP INTELLIGENT MONITOR MODULE SLC NO 1 NO 2 NC 2 COMM 2 COMM 1 ...

Page 4: ...a Return Authorization number send defective units postage prepaid to System Sensor Returns Three Year Limited Warranty Department RA __________ 3825 Ohio Avenue St Charles IL 60174 Please include a note describing the malfunction and suspected cause of failure The Company shall not be obligated to repair or replace units which are found to be defective because of damage unreasonable use modificat...

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