DATE: 10-02-03
FILE: IM_091-85-XX_Rev_A
INSTRUCTION MANUAL
LOW VOLTAGE
ALARM 1901
A LOW VOLTAGE DETECTOR WITH
TIME DELAY TO MEET THE REQUIREMENTS
OF NFPA 1901
MODEL(s)
091-85-12
091-85-24
091-85-24-VER
3 YEAR WARRANTY
KUSSMAUL ELECTRONICS CO., INC.
170 CHERRY AVE., WEST SAYVILLE, N.Y. 11796-1221
TEL: in NY 631-567-0314 TOLL FREE: 800-346-0857 FAX: 631-567-5826
INTRODUCTION:
NFPA 1901, Standard for Automotive Fire Apparatus, 1996 Edition, paragraph 9.3.3 requires a
low voltage alarm to detect whenev er the battery voltage of a vehicle drops below a threshold f or
a 2 minute interval. The Model 091-85-XX, Low Voltage Alarm/1901 is a voltage sensing device
which is designed to fulfill the requirements of referenced NFPA 1901 Standard.
The Model 091-85-XX contains voltage sensing circuits, a 2 minute timer , an output rela y as well
as RED and GREEN colored LEDs to indicate status.
In operation the Model 091-85-XX continually monitors a system voltage present at J1-1 (+ VDC)
with respect to J1-2 ( VDC Return). When the system voltage is equal to or greater than the
following “Low Voltage Thresholds” the GREEN LED is illuminated indicating a normal system
voltage.
Model Type Nominal System Voltage Low Voltage Threshold
091-85-12 12.0VDC 11.8VDC
091-85-24 24.0VDC 23.6VDC
091-85-24-VER 24.0VDC 23.0VDC
Whenever the monitored system v oltage drops below the Model T ype “Low Voltage Threshold” a
timer internal to the Model 091-85-XX is started. If the Low Voltage condition continues f or more
than 2 minutes the Model 091-85-XX output RELA Y is energized, the GREEN LED will e xtinguish
and the RED LED will illuminate. The output RELAY will remain energized (COM makes NO) until
the sensed system voltage rises above;
12.8VDC for Model 091-82-12
25.6VDC for Model 091-85-24
24.8VDC for Model 091-85-24-VER
The output relay has both normally open (NO) and normally closed (NC) contacts available
providing the installer with complete flexibility in wiring the alarm circuit. An y external alarm indicator
or alarm horn must be provided by the installer consistent with the output relay contact ratings
provided in Model specifications. The Model 091-85-XX is NOT w aterproof so it is suggested that
it be mounted in a suitable location. Care should be taken to wire the +VDC
sense lines to an electrical point representative of system voltage monitoring requirements so
that an accurate indication of system voltage ma y be obtained. Fuse +VDC sense line as required
using ONLY an ultra low resistance/voltage drop device.
Refer to Figure 1 for illustr ation of a typical wiring configuration and output relay contact rating(s).
AND VDC Retur n
SPECIFICATION AND OUTLINE
T emperature Environment: Model 091-85-12, -24; 0 to 50 deg C.
Model 091-85-24-VER; 0 to 100 deg C
Main Input Power: Model 091-85-12; 12VDC Nominal
Model 091-85-24-XX; 24VDC Nominal
Input Current: Model 091-85-12: 120 ma, relay ON, 50 ma relay OFF
Model 091-85-24: 75 ma, relay ON, 30 ma relay OFF
Output Relay Rating: Model 091-85-12:
30A/240V AC/14VDC NO
20A/240V AC/14VDC NC
Model 091-85-24-XX:
30A/240V AC/14VDC
Low V oltage Alarm Threshold: Model 091-85-12; 1 1.8VDC
Model 091-85-24; 23.6VDC
Model 091-85-24-VER: 23.0VDC
Restoration V oltage Threshold: Model 091-85-12; 12.8VDC
Model 091-85-24; 25.6VDC
Model 091-85-24-VER: 24.8VDC
Low V oltage Duration for Alarm: Fixed: T wo (2) minutes +/- .5 minutes.
Weight: 0.5 lbs
5.10
3/16" DIA.
4,50
OUTLINE
2.95
1.55
INSTALLATION RECORD & WARRANTY
Date Installed
Installed By
Vehicle Identification
Vehicle Owner
WARRANTY
All products of Kussmaul Electronics Company Inc. are warranted to be
free of defects of material or workmanship. Liability is limited to repairing or
replacing at our factory, without charge, any material or defects which become apparent in normal use within 3 years from the date the equipment
was shipped. Equipment is to be returned, shipping charges prepaid and will
be returned, after repair, shipping charges paid.
Kussmaul Electronics Company, Inc. shall ha ve no liability f or damages
of any kind to associated equipment arising from the installation and /or use
of the Kussmaul Electronics Company, Inc. products . The purchaser , by the
acceptance of the equipment, assumes all liability for any damages which
may result from its installation, use or misuse, by the purchaser, his or its
employees or others .
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