Model 906
Battery “Fuel” Gauge
Model 906 is an inexpensive, one piece, easy to install battery fuel gauge. It is completely solid state and provides
a reliable, accurate, and easy to read display of battery state-of-charge. Model 906 is available in six panel mount
packages and a printed circuit board mounted module for custom dash panel applications. This battery fuel
gauge features Curtis patented technology and is ideal for golf cars, commercial cleaning equipment, mobility
aids, electric bicycles, electric marine motors, medical devices, and similar equipment.
FEATURES
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All principal circuits are integrated in a single chip for
long-life reliability.
A 10-bar LED displays the state-of-charge
successively, bar by bar, from full to empty.
At 70% depth of discharge, a flashing LED signals an
“energy reserve” alert.
At 80%, alternately flashing LEDs provides an
“empty” status warning.
Model 906 is compact and easily installed in panel
cutouts as small as 36.8 X 24.1 mm, with as little as
35 mm behind panel clearance needed, see
dimensions of various case styles.
Recognizes improperly charged battery.
Keyswitch activated LED display (state-of-charge is
monitored as long as 906 is connected to battery).
Memory allows gauge to recall state-of-charge
whenever battery is disconnected.
Three possible reset methods:
1.
Open Circuit Reset (OCR): Upon reconnection of
a battery the gauge will reset if it measures 2.09
volts/cell or higher (example “B” profile) (for units
with memory option).
High Voltage Reset (HVR): Gauge must measure
>2.35 volts per cell for 6 continuous minutes
during charging (example “B” profile).
Charge Tracking Reset (CTR): Display tracks charge
level during opportunity charging (requires gauge
to be connected to battery when charging)
OPTIONS
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The Output Signal option causes the voltage on pin 3 to
drop from 5 to 0 volts at 80% discharge. It can be used to
signal another component or to allow for the disabling of
a specified vehicle function, insuring against abusive deep
discharge conditions. The Output Signal can also be used
to drive the Curtis 1178 Relay Module.
Special models and custom panels are available.
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SPECIFICATIONS
System Voltages: 12V, 24V, 36V, 48V
Operating voltage: +/–25% of nominal voltage
Operating temperature: –40°C to +85°C
Storage temperature: –50°C to +90°C
Shock & Vibration: Meets SAE J 1378
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See a 360° view of Model 906 at:
curtisinstruments.com/360view
2.
3.
www.curtisinstruments.com
2
1 2 3 4
23.8
27.5
Model 906
DIMENSIONS mm
continued
NOTE: Equivalent to Delphi-Packard connector P/N 15336035 4-pin.
Battery “Fuel” Gauge
28.8
36.7
18.0
4.7
40.6
Z Case:
Case Style Z
1
4
2
23.8
27.5
3
NOTE: 1/4" fast on spade terminals.
2.0
+ P
13.0 Min
9.5
19.0 Max
26.70
1
Module P
Module:
4
+
COMPONENT
SIDE
2.0
2
3
+
+
14.0
19.0 Max
10.50 Max
33.0 Max
28
0.8±.02 Dia.
4 Places
10.50 Max
33.0 Max
THUMBNUT 4MM
LOCKWASHER 4MM
SEE NOTE 2.0
“U”CLAMP FOR .8 MM TO 6.4 MM.
PANEL THICKNESS
Case Style R
1
4
2
51.5 MAX
3
0
1
8.9 MAX.
NOTE: 3/16" fast on spade terminals.
NOTE 2.0: OEM's are supplied with hex
nuts and lock washers only. They do not
receive thumbnuts.
28.6 MAX.
13.2 MAX.
58.4 MAX.
Pin
906
F
Case Styles
F
T
J
D
Y
Z
P
R
Function
B+
A
B–
Output Signal + or No Option
Option
A=No option
Keyswitch +
24
Voltage
12V
24V
36V
48V
H
Reset Level
H=2.35 V/cell HVR
B=2.09 V/cell OCR
N
Discharge Profile
PIN 1
PIN 2
PIN 3
PIN 4
A
Special Options
N=2.04 V/cell @ full to 1.73 V/cell @ empty
[G=1.97 V/cell @ full to 1.75 V/cell @ empty]
[W=2.02 V/cell @ full to 1.85 V/cell @ empty]
www.curtisinstruments.com
D=Output signal
5 ± 0.5V above empty
0 to 0.1 V at empty
10K W impedance
4
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