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Refill the DO500 membrane system with the specified solution.
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APERA INSTRUMENTS / DO502 / AI4112
Apera DO502 is a 30 mL inner solution refill for the Apera DO500 polarographic dissolved oxygen electrode. It is the solution specified in the DO500 membrane-cap replacement procedure, with an exact-SKU safety data sheet available for handling and storage guidance.
CURRENT ITEM: DO502
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
The DO502 product description names the DO500 polarographic electrode. The SX716 manual specifies new DO502 solution when fitting a DO503 membrane cap.
Both the manufacturer product title and replacement-parts table identify a 30 mL refill.
The manufacturer-linked SDS identifies part number AI4112 under the name Dissolved Oxygen Electrode Reference Solution, revision 09/01/2026.
Optical sensor caps and polarographic membrane components are different replacement systems. A shared brand or similar appearance does not establish interchangeability.
Follow section 4.5.4 of the SX716 meter manual when replacing the membrane cap. Add fresh DO502 inner solution slowly into the new DO503 cap and remove air bubbles as instructed before assembly.
Fit and tighten the cap using the manual procedure, then wipe away displaced solution and rinse the electrode. For SX716 operation, allow 30 minutes of polarization after adding new inner solution and complete the applicable calibration procedure.
Use fresh DO502 solution when replacing a DO503 membrane cap on the DO500 electrode.
The SX716 maintenance instructions call for new inner solution when removing air bubbles from within the electrode membrane cap.
The AI4112 SDS advises avoiding eye contact and keeping the container closed, protected from direct sunlight, at room temperature of 15 to 25°C. Consult the complete SDS for first aid and handling instructions.
This refill belongs inside the specified DO500 electrode membrane system. Follow the electrode maintenance instructions rather than treating it as a general-purpose calibration or storage solution.
DO502 is supplied as a 30 mL inner solution refill.
Apera explicitly specifies the DO500 polarographic dissolved oxygen electrode.
This listing is for the DO500 polarographic refill. Do not select it for DO803 or DO810 optical probes.
The manufacturer identifies DO502 as an inner solution refill, and the manual uses it inside the membrane cap. It is not presented here as a calibration standard.
Yes. The manufacturer-linked SDS identifies part number AI4112, titled Dissolved Oxygen Electrode Reference Solution, with revision date 09/01/2026.
The SDS specifies a closed container, protection from direct sunlight and room temperature of 15 to 25°C.
For SX716 operation, the manual requires 30 minutes of electrode polarization after adding new inner solution, rather than the routine five-minute power-on period.
The DO502 listing is for the 30 mL refill. DO503 membrane caps are a separate replacement item.
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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