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825P-850P DIGITAL PULSE OUTPUT METERS
Electrical Wiring Information
CONNECTOR PINOUT
FUNCTION
5-24V DC
GROUND
4-20mA SUPPLY
4-20mA RETURN
PULSE OUTPUT (S+)
AIR DETECT (S+)*
PULSE OUTPUT AND AIR DETECT ARE CURRENT SINKING OUT-
PUTS (OPEN COLLECTOR)
* THE AIR DETECT OUTPUT IS NOT AVAILABLE ON 825P MODELS
825P / 850P Series Digital Meters are equipped with an integral
pulser for use with Fuel Management Systems and batching
equipment. These meters must also be connected to an auxiliary
external power supply to operate the pulsing feature. 5-24V DC
external power is required for the pulse outputs on pins 2 and 3
to operate. Failure to attach external power can cause premature
battery failure. External power must be from 5 - 24V DC.
NOTE: When powering the 4-20mA loop, a minimum of 7V DC
is required at the 825P/850P meter for consistent operation.
The manufacturer of the 4-20mA receiver will supply voltage
drop information as well as their minimum voltage require-
ments in their literature.
sotera.com
PIN
COLOR
1
BROWN
5
GREY
6
PINK
4
BLACK
2
WHITE
3
BLUE
INSTALLATION AND OPERATION MANUAL
PULSE AND AIR DETECT
100mA MAXIMUM PER OUTPUT
24V DC MAXIMUM PER OUTPUT
PULSE WIDTHS ARE A FIXED 10 mS ON TIME
RECOMMENDED PULL-UP
5V DC
12V DC
24V DC
NOTE: If the meter is to be used in environments with high
levels of EMC or RF sensitive equipment, connect the braided
shield of the cable to an earth ground.
The 825P / 850P meters are designed to conduct ESD and EMC
surges through the braided shield.
NOTE: The pulse width for volumetric output and air detect is 10ms.
DO NOT connect the braided shield to the ground of the Power
Supply, or the 4-20mA loop power.
DO NOT install or operate this meter in an explosive atmosphere!
OPERATIONAL LIMITS
RESISTOR VALUES
330 Ohm
1/8 WATT MIN
1k Ohm
1/4 WATT MIN
2.4k Ohm
1/2 WATT MIN
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