Baxter AS-50 Service guideline

Title: Baxter AS50. Syringe Pump DATE: June 4, 2016

File = Baxter-AS50.doc

DISCLAIMER: THIS PROCEDURE PROVIDED "AS IS" AND
WITH POSSIBLE FAULTS. USER MUST VERIFY BEFORE
USE. NEITHER PROVIDER NOR WEBSITE ASSUMES ANY
RESPONSIBILITY FOR ITS USE.

1. General
Applies to the Baxter Model “AS50 syringe pump.

2. Reference Documents
Auto Syringe® AS50 Infusion Pump Operator’s Manual
Auto Syringe® AS50 Infusion Pump Service Manual
(Pump Catalog Code # 1M8550)

3. Tools / Fixtures / Labels
60cc Syringe, Charger HHD 12-250 (12.6V, 250mA)

4. Setup/Notes
Water: 1 gm = 1cc @ 4 deg C.
Battery: 6 volt, 1.5 amp hour Nickel Metal Hydride (ex: Unipower
B11056)

5. Basic PM Procedure

5.1. Power On Self Test (On/Off switch is on left side of pump)

The pump sounds a high-low beep;
All segments of the LCD and the LEDs momentarily turn on;
The pump sounds one short beep;
An identifier (AS50) is momentarily displayed at the bottom of the display

5.2. Date and Time Update

To activate the Configuration Set mode, press the key sequence 9,8,0,5 following completion of the
POST, when the display shows CONFIG. At this point you need to review and address multiple
subsections before coming to CLOCK. Enter the current time and date using the <EDIT> as an “Enter”,
followed by a final <CONFIRM>

5.3. Keypad Check -- Press and briefly hold down the

START and STOP keys one at a time. The pump
should sound repeated beeps while each key is held
down. Press every key, except the arrow keys, in
any order, one key at a time. Each key press should
result in a short beep. More checks can be found in
the service manual.

5.4. Range of Motion Check -- Check that the plunger

seats properly and that the plunger driver does not
slip on the leadscrew when the plunger is fully
closed.
Check that both barrel clamp release levers operate
properly. Check the tab lock to be sure it opens
when the barrel clamp is fully opened and closes
when the barrel clamp is fully closed

Note: The barrel unlock lever is right next to the On-Off switch. See photo showing how syringe flange is
gripped by the mechanism after the clamp is pressed onto the barrel.

5.5. Accuracy Quick Check: (see volume tables in Appendix for measurement options.) Instead of

measuring a volume of fluid delivery, the unit can be programmed using settings from Table 2, and then
measuring the syringe travel as listed.

5.6. Normal Accuracy Test (per factory)

1. Install an empty B-D® or Monoject® 60 mL syringe in the pump. Set the plunger at the 60 mL mark
on the syringe. This setup uses/checks the full travel of the lead screw.

2. Program the pump as follows: MODE: mL/hr mode; MFG: B-D® or Monoject®; SIZE: 60 mL;
RATE: 200 mL/hr; VOL LIMIT: 60 mL;

3. Record start volume from the syringe. Use the graduations on the syringe to determine the volume.

4. Set the timer for 15 minutes. Simultaneously start the timer and press the START key on the pump to
start the infusion process.

5. During the infusion, the pump emits 5 beeps, the ALERT LED flashes and “< 10 MIN VOL LIM”
appears on the display.

5.7. Results After 15 minutes, press the STOP key on the pump. Record the stop volume on the syringe.

Subtract the stop volume from the start volume and record the result as the volume delivered. The
volume delivered must be between 48.5 cc and 51.5 cc. (i.e. +/- 3%).

5.8. Battery / Charger Check (~6 volts, 5 NiMH AA cells)

Pressing <CONFIRM> while the pump is on-but-stopped normally displays battery voltage. With no charger, a
“pumped stopped” voltage of 6.1 or less indicates low battery. Baxter defines a charged battery good if v >= 6.5v.
Battery charging is indicated by the “ON CHARGE” LED even with the pump switched off. Access the bat by
removing the pole clamp and the 3 small screws holding the battery cover.

5.9. Occlusion PSI Test: (occurs at 10 to 12 psi)

1. Fill a B-D® or Monoject® 60 mL syringe with 60 mL of distilled water.

2. Attach a 60 inch High Flow Rate Extension Set or equivalent to the end of the syringe and manually
purge the air from the syringe and tubing.

3. Install the syringe on the pump and connect the distal end of the tubing set to a calibrated pressure
gauge (optional).

4. Turn on pump. If there is a message like “Select Library”, hit the <down arrow> to change the
display to “NONE”. Then press <CONFIRM>. Then press the <down arrow> enough times to display
ML/HR.

5. Program the pump as follows:
MODE= mL/hr mode; B-D® or Monoject® SIZE: 60 mL; RATE: 100 mL/hr; VOL LIMIT: 60 mL.
See table below for other testing options.

5. Press START. Verify that the pump displays RUNNING at the bottom of the display for
approximately two seconds and the run LEDs are flashing in descending order (top to bottom).

7. If a pressure gauge is not attached to the extension set, block off the end of the extension set to
simulate an occlusion. If a pressure gauge is attached to the extension set, wait for an occlusion to occur

8. Verify that, as the pump senses the occlusion, LINE OCCLUDED is displayed,
ALERT and STANDBY LEDs flash, and the pump beeps continuously.

9. Press CONFIRM to silence the alarm. Remove the syringe from the pump. Disconnect pressure
gauge if necessary.

5.10. Near End Alarm Test:

1. Install an empty B-D® or Monoject® 60 mL syringe in the pump. Set the plunger at the 60 mL mark
on the syringe.

2. Program the pump as follows: MODE: mL/hr mode; MFG: B-D® or Monoject® SIZE: 60
mLRATE: 280 mL/hr; VOL LIMIT: 50 mL; 3. Press START.