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The specified membrane-cap replacement for Apera DO500.
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APERA INSTRUMENTS / DO503 / AI4113
The Apera DO503 pack contains three replacement membrane caps for the Apera DO500 polarographic dissolved oxygen electrode. Use the specified caps and fresh DO502 inner solution when servicing the DO500 membrane assembly.
CURRENT ITEM: DO503
These are selected compatible meter-system or related-workflow pages, not additional items supplied with this accessory. Match the exact probe or component in the compatibility table below.
Related workflow: meter supplied with DO500
Apera identifies DO503 as the replacement membrane cap for DO500. Select by electrode model, not by the meter connector.
The official product description and SX716 replacement-parts table both specify three caps.
Section 4.5.4 of the SX716 manual explains cap replacement with new DO502 inner solution.
Optical sensor caps and polarographic membrane components are different replacement systems. A shared brand or similar appearance does not establish interchangeability.
The SX716 manual instructs you to remove the old membrane cap, rinse the electrode with distilled water and clean the gold cathode as directed. Slowly add fresh DO502 inner solution to a new DO503 cap without introducing air bubbles.
Assemble the cap vertically and tighten as directed. Wipe away displaced solution and rinse the electrode. Inspect for trapped air; reassembly may be necessary. Refer to section 4.5.4 for the complete procedure.
The SX716 manual calls for replacement when the membrane is wrinkled, cracked or damaged.
Inspect the membrane when response becomes slower or obvious measurement errors occur, following the manual before replacing components.
Do not touch the sensitive membrane directly with your fingers. The manual warns that sweat and grease affect membrane quality.
After fitting a new membrane cap or adding new solution, the SX716 procedure requires 30 minutes of polarization. Follow the meter calibration procedure before resuming measurement.
Each DO503 pack contains three replacement membrane caps.
The manufacturer explicitly specifies Apera DO500 polarographic DO electrode compatibility.
No. This is the DO500 polarographic membrane cap. Do not substitute it for the optical sensor cap specified for DO803 or DO810.
The DO503 listing specifies three caps only. Order DO502 inner solution separately when it is needed.
The SX716 manual identifies a wrinkled, cracked or damaged membrane, slower response or obvious measurement errors as reasons to inspect and replace the cap.
Avoid direct finger contact with the sensitive membrane because sweat and grease affect membrane quality.
Not for the SX716 procedure after cap replacement. Its manual specifies 30 minutes when a new cap or new inner solution is installed.
Section 4.5.4 of the linked SX716 meter manual covers membrane-cap replacement. The document is a meter manual, not a standalone DO503 manual.
Consumable identification and handling
Use this item only for the specified DO500 polarographic maintenance procedure. Follow the supplied label, safety documentation where applicable, and the named meter manual. No unverified consumable warranty, shelf life or transportation classification is promised.
These complete official documents cover the named meter system, accessory procedure or exact reagent. Parent-meter manuals are not standalone accessory specifications. Check the model and document scope before using a procedure.
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