Specifications

1
APPLICATION NOTE NO. 40 Revised May 2005
SBE 5T PUMP SPEED ADJUSTMENT INSTRUCTIONS
Equipment: DC power supply Drawings: 31441B (schematic)
Frequency counter 41250A (assembly)
The pump housing must be disassembled to adjust the pump speed. Referencing above drawings:
1. Remove the white plastic end cap retainer ring located at the connector end of the pump by twisting in a
counter-clockwise motion.
2. Install a 2-pin dummy plug with locking sleeve over the bulkhead connector to provide a good grip on
the pump connector and protect the connector pins. Rotate the connector back and forth while carefully
pulling the end cap away from the housing. Pull the end cap (piston o-ring seal) out of the housing. The
motor and electronics assembly are attached to the end cap and will come out as a unit.
3. Connect the positive lead of your frequency counter to the yellow test post (T1) (drawing 41250A).
Connect the frequency counter ground (negative) to the power supply ground (negative).
4. Supply power:
Low voltage pump (pump with LV in the serial number) - Supply 6 volts DC power to the
bulkhead connector (large pin is common, small pin is positive) or directly to the PCB
(P8 is positive, P19 or P18 is common, drawing 41250A).
Normal voltage pump - Supply 12 volts to the bulkhead connector (large pin is common, small pin
is positive) or directly to the PCB (P8 is positive, P19 or P18 is common, drawing 41250A).
5. A 2K ohm potentiometer (R11, drawing 41250A) is located on the back side of the board. Adjust the
potentiometer to obtain the frequency corresponding to the desired speed (Frequency * 30 = rpm):
Pittman 18.2 motor (P/N 3711B113-R1) - Set jumper position P15 to P17 (1300 rpm) and P12
to P13 (1300 rpm), and adjust the speed as desired, up to the nominal maximum of 2000 rpm.
Pittman 7.4 motor (P/N 3711B112-R1) - Set jumper position P15 to P16 (3000 rpm) and P14
to P13 (3000 rpm), and adjust the speed as desired, up to the nominal maximum of 4500 rpm.
To adjust speed below approximately 2200 rpm, set jumper position P15 to P17 (1300 rpm) and
P12 to P13 (1300 rpm), and adjust speed using the potentiometer.
Pittman 3.55 motor (P/N 3711B112-R2) - Set jumper position P15 to P16 (3000 rpm) and P14
to P13 (3000 rpm), and adjust the speed as desired, up to the nominal maximum of 4500 rpm.
To adjust speed below approximately 2200 rpm, set jumper position P15 to P17 (1300 rpm) and
P12 to P13 (1300 rpm), and adjust speed using the potentiometer.
6. Disconnect the frequency counter and the power supply. Make sure the O-ring and mating surfaces
are clean. Lightly lubricate the o-ring before inserting the connector end cap into the housing. Replace
the pump end cap retainer.
Sea-Bird Electronics, Inc.
1808 136th Place NE
Bellevue, WA 98005
US
A
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.seabird.com
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