APPLICATION NOTE NO. 40
SBE 5T and 5P Pump Speed Adjustment Instructions
Revised September 2011

Print version

Equipment: DC power supply , Frequency Counter
Drawings (below): 31441B (schematic), 41250A (assembly)

The pump housing must be disassembled to adjust the pump speed. SBE 5P and 5T electronics are the same, but separate instructions for removing and reinstalling the electronics in the housing are provided for each pump, because of differences in mechanical details.

Note: In September 2011, Sea-Bird changed the SBE 5T mechanical design; the new design is easily differentiated from the old design because the new design does not have a retaining ring (see photo below). The old SBE 5T is opened from the end with the retaining ring and bulkhead connector; the new SBE 5T is opened from the end with the pump head. Instructions for disassembly/reassembly of the new SBE 5T pump are identical to those for the SBE 5P pump.

1. Remove the electronics from the housing:

• SBE 5T Titanium Pump with retaining ring (old design, discontinued September 2011) --

1. Unscrew the white plastic end cap retainer ring.
2. Install a 2-pin dummy plug with locking sleeve over the bulkhead connector to provide a good grip and protect the connector pins. Rotate the end cap back and forth while carefully pulling the end cap away from the housing. Pull the end cap and attached electronics out of the housing.
    

   SBE 5T (old design, discontinued September 2011)

• SBE 5P Plastic Pump and
  SBE 5T Titanium Pump without retaining ring (new design, September 2011) --

1. Unscrew the pump head from the housing.
2. Pull out the end cap from the housing.
3. Pull out the electronics from the housing. Note that the electronics are wired to the bulkhead connector inside the housing.

SBE 5T (new design, September 2011)

SBE 5P

2. 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).
3. Supply power:

• Low voltage pump (pump with LV in the serial number) -- Supply 6 volts DC power to the bulkhead connector 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 or connect directly to the PCB (P8 is positive, P19 or P18 is common, drawing 41250A.)

4. 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 ohm 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 ohm 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 the jumper position P15 to P17 (1300 rpm) and P12 to P13 (1300 rpm), and adjust speed using the potentiometer.
• Pittman 3.55 ohm 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 the jumper position P15 to P17 (1300 rpm) and P12 to P13 (1300 rpm), and adjust speed using the potentiometer.

5. Disconnect the frequency counter and the power supply.
6. Reinstall the electronics in the housing.

• SBE 5T Titanium Pump with retaining ring (old design, discontinued September 2011) --

1. Inspect the connector end cap o-ring and the mating surface in the housing for dirt, nicks, and cuts. Clean as necessary. If the o-ring or mating surface is damaged, return the pump to Sea-Bird for repairs.
   Note: Sea-Bird recommends that connector end cap o-ring replacement be performed at the factory, because the pump’s physical configuration makes customer-replacement of this o-ring difficult to perform without special tools.
2. Apply a light coat of o-ring lubricant (Parker Super O Lube) to the o-ring and mating surfaces. Gently place a new desiccant bag (PN 30558 -- 1 gram) on the electronics (see Application Note 71 for desiccant use and regeneration). Reinstall the electronics in the housing, until the o-ring has fully seated. Reinstall the retaining ring on the connector end cap.

• SBE 5P Plastic Pump and
  SBE 5T Titanium Pump without retaining ring (new design, September 2011) --

1. Clean the connector end cap o-ring and the mating surface in the housing for dirt, nicks, and cuts. Clean and/or replace o-rings as necessary.
2. Apply a light coat of o-ring lubricant (Parker Super O Lube) to the o-ring and mating surfaces. Gently place a new desiccant bag (PN 30558 -- 1 gram) on the electronics (see Application Note 71 for desiccant use and regeneration). Reinstall the electronics in the housing. Reinstall the end cap in the housing, carefully aligning the end cap with the housing and pushing hard on the end cap to seat the first o-ring in the housing (only 1 o-ring should now be visible).
   CAUTION: If you are not careful, you may pinch the o-ring which may allow water to enter the housing, damaging the electronics.
3. Reinstall the pump head on the end cap.

View drawings:

Drawing 31441B (schematic)

Drawing 41250A (assembly)

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