25
EXAMPLE
Predelivery Weight
61.1 g
Postdelivery Weight
‑ 41.6 g
Weight of Amount Delivered
19.5 g
= 19.5 ml
Volume of Amount Delivered
19.5 ml
Intended Delivery Volume
‑ 20.0 ml
Inaccuracy Volume
– 0.5 ml
Inaccuracy Volume
– 0.5 ml
Intended Delivery Volume
÷ 20.0 ml
Accuracy Error
-0.025 ml
Accuracy Error
‑0.025
x 100.00
Accuracy Error Percentage
–2.5%
Volumetric Accuracy Testing (Option 2)
Description
A predetermined amount of water is delivered
into a collection device such as a burette or
graduated cylinder. The amount of water
delivered is compared to the amount that the
pump should have delivered.
Nominal system accuracy is given in the
technical specifications section for the pump.
That is, under the test conditions described
below, the accuracy of the pump and reservoir
will be nominal with a 90% confidence level. The
nominal test conditions are as follows degassed
water at 25 ± 5°C without back pressure.
Equipment needed
• 50‑ or 100‑ml CADD
™
medication cassette
reservoir
• 50‑ or 60‑ml syringe
• CADD
®
extension set with anti‑siphon valve
• A fluid collection device such as a burette or
a class A 25 ml capacity graduated cylinder
• 40 ml of room temperature water
Procedure
1. Fill the 50‑ or 60‑ml syringe with 40 ml of
water. Transfer the water into a
CADD
™
medication cassette reservoir.
2. Remove any air from the CADD
™
medication
cassette reservoir by aspirating the air with
the syringe. Attach the CADD
®
extension set
with anti‑siphon valve. Prime the tubing so it
is filled with fluid to the end of the extension
set luer lock connector.
3. Attach the end of the extension set to the fluid
collection device.
4. Attach the CADD
™
medication cassette
reservoir to the pump. Program the reservoir
volume to 20 ml. This is the
intended delivery
volume
. Open all clamps.
5. Program a continuous rate of 0.0 ml/hr and a
Demand Dose of 1.0 ml (but do not deliver a
Demand Dose). Start the pump and deliver a
clinician bolus of 20 ml.
6. When delivery is complete, record the volume
of fluid delivered. This is the
actual delivery
.
7. Find the difference between the volume of the
amount delivered and the intended delivery
volume. This is the
inaccuracy volume
.
8. Divide the inaccuracy volume by the
intended delivery volume and multiply by 100.
This is the
accuracy error percentage
.
(See Table 15.)
9. If the accuracy error percentage is greater
than ±6%, repeat the test with a new
reservoir. If the pump fails a second time,
call Smiths Medical’s Customer Service
Department.
Intended
Actual
Inaccuracy
Accuracy
Accuracy
Delivery
Delivery
Volume
Error
Error Percentage
Volume
Volume
20 ml
19.5 ml
‑0.5 ml
‑0.5/20.0 ml =‑0.025
‑0.025 x 100 =
±
2.5%
Table 15. Volumetric percentage calculation
