Baseline Systems BHM Series Hydrometer - Manual (Page 9)

Hydrometers Operation and Maintenance Manual •
9
Recommended
Resistor Valves
Ω W
5 180 0.25
6 220 0.25
9 330 0.25
12 470 0.50
24 1000 1.00
Voltage (V+)
Resistor Values
NOTE: Correct polarity of the leads should be
checked carefully to prevent damage to
the sensor.
Specifications, Cont.
Photo-Diode Electrical
Specifications
POSITIVE powers the IR light
(yellow wire)
Current Min: 15 mA to a maximum of 25 mA DC
through a resistor
• Maximum Voltage: 28 VDC
OUTPUT (clear wire)
Output – Open collector
(Max. Load – 2 mA)
GROUND (bare wire)
Photo-Diode (PD & PDH) Register
• Sensor combines an IR light source and a light sensitive
diode in one package.
• Signals are created when the light beam created by the
IR light is interrupted by a rotating element.
• Requires a constant supply of DC power.
Circuit Diagram
Register with Photo Diode
Output and Wire Leads
Note: Sunlight will interfere
with the IR light and may
corrupt or interfere with the
signal—keep dust cap closed
during operation to ensure
proper signal output.