HYDROS 28ppt Salinity Calibration Reference Solution, 100 mL
SKU: HDRS-SCS28
- Essential Two-Point Probe Reference: Serves as the mandatory low-range (28 ppt) calibration standard required alongside 35 ppt fluid to calibrate HYDROS K-10 Salinity Probes.
- Laboratory-Grade Aqueous Precision: Formulated with ultra-pure deionized water and analytical-grade sodium chloride (NaCl) for a verified 28.0 ppt (~1.021 Specific Gravity) baseline.
- Convenient 100mL Dispensing Bottle: Compact 100mL (~3.38 fl oz) HDPE squeeze bottle provides ample fluid for multiple probe calibrations and routine refractometer checks while minimizing shelf space.
- Broad Instrument Compatibility: Accurately calibrates HYDROS Control X3-S, Control X10, Control Pro, HYDROS iV isolation vessels, optical refractometers, and digital conductivity meters.
- Evaporation-Resistant Seal: Fitted with a tight-sealing flip cap to prevent moisture loss and salinity concentration drift between scheduled calibration sessions.
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HYDROS 28ppt Low-Range Salinity Calibration Reference Solution (100mL)
Accurate salinity monitoring is fundamental to marine aquarium stability, governing osmoregulation in fish, calcification rates in stony corals, and automated top-off safety. However, conductivity probes and optical refractometers naturally experience gradual sensor drift, electrode coating, and thermal shifts over time. Calibrating seawater testing instruments with plain RO/DI water introduces severe slope inaccuracies across the narrow 25–40 ppt marine operating range. The HYDROS 28ppt Salinity Calibration Solution (100mL) (SKU: HDRS-SCS28) is the official OEM reference fluid engineered specifically for HYDROS Salinity/Conductivity Probes, Digital Salinity Monitors, and Refractometers.
To achieve true laboratory accuracy across fluctuating reef salinity levels, HYDROS K-10 conductivity probes utilize a two-point calibration curve anchored at 28 ppt and 35 ppt. By referencing both ends of the marine operating spectrum, your HYDROS controller calculates an exact linear conductivity slope rather than relying on a single-point assumption. Blended from ultra-pure reagent water and precision-weighed sodium chloride, each 100mL bottle of HDRS-SCS28 delivers an exact 28 parts per thousand concentration (~1.021 Specific Gravity / ~43.5 mS/cm conductivity at 25°C). Beyond reef probe calibration, this 28 ppt standard also provides a direct target benchmark for aquarists managing FOWLR systems, fish conditioning tanks, or therapeutic lower-salinity quarantine setups.
Ideal Application & Upgrade Scenarios
If you operate a HYDROS Control X3-S, Control X10, or HYDROS Salinity Kit and need a fresh 100mL bottle of low-range fluid for your scheduled 8-week probe recalibration, if you are dialing in an optical refractometer for a 1.021 SG quarantine system, or if your older calibration solution has experienced evaporation, HDRS-SCS28 restores verified diagnostic precision.
Note: 35ppt calibration solution, K-10 conductivity probe, HYDROS iV isolation vessel, and refractometers are sold separately
What’s Included:
(1) 100mL Bottle of HYDROS 28ppt Salinity Calibration Solution (HDRS-SCS28)
Technical Specs:
SKU / Factory Part Identifier: HDRS-SCS28
Bottle Volume: 100 mL (~3.38 fl oz)
Calibrated Salinity Reference: 28.0 Parts Per Thousand (ppt) / 28.0 PSU
Equivalent Specific Gravity: ~1.021 SG (at 25°C / 77°F)
Equivalent Conductivity: ~43.5 mS/cm (at 25°C / 77°F)
Chemical Composition: Analytical-Grade Sodium Chloride (NaCl) in Ultra-Pure Deionized Water
Container Design: High-Density Polyethylene (HDPE) Squeeze Bottle with Tight-Sealing Flip Cap
Shelf Life: Up to 24 Months when tightly capped and stored out of direct sunlight
Compatible Equipment:
Lab-Grade K-10 Salinity/Conductivity Probe
HYDROS Control X10, Control Pro, and Control X3-S
HYDROS iV Automated Testing & Isolation Vessel
Optical Salinity Refractometers, Digital Seawater Refractometers, and Pinpoint Conductivity Monitors
While most of our equipment carries a one-year manufacturer's warranty, consumable products like fish and coral foods are not covered under traditional warranty terms due to their perishable nature and varied storage conditions. However, we fully stand behind the quality of every product we sell. If you experience any issues with your food purchase shortly after receiving it, such as concerns about freshness, packaging integrity, or product quality, please contact us at [email protected]. We're committed to making it right and will work with you to resolve any problems quickly and fairly.
Calibration & Handling Guidelines:
Temperature Acclimate the Fluid: Before calibrating, allow the closed 100mL bottle of HDRS-SCS28 to sit near your sump or float in a sealed bag in tank water for 15–20 minutes so the fluid matches ambient probe temperature.
Prepare the Sensor: Rinse your HYDROS K-10 conductivity probe tip in clean RO/DI water and gently shake or blot away excess moisture with a lint-free tissue.
Dispense a Separate Sample: Pour a small amount of HDRS-SCS28 into a clean, dry diagnostic cup or sample vial. Never submerge a probe directly into the 100mL bottle to avoid cross-contamination.
Eliminate Air Bubbles: Submerge the probe tip completely into the sample cup and swirl gently for 5–10 seconds to dislodge micro-bubbles trapped inside the electrode guard.
Stabilize & Calibrate: Allow 1 to 2 minutes for the probe's temperature compensation sensor to equalize. Open the HYDROS app, navigate to your Salinity Input calibration menu, select the 28 ppt low-point step, and confirm once the raw reading stabilizes.
Complete Two-Point Curve: Rinse the probe in RO/DI water, blot dry, and proceed to the 35 ppt calibration step using HYDROS 35ppt calibration fluid.
For Optical Refractometers: Place 2 to 3 drops of HDRS-SCS28 onto a clean, dry daylight prism, close the cover plate, wait 30 seconds for temperature equalization, and turn the calibration screw until the shadow line aligns exactly with 28 ppt (or 1.021 SG).
Discard the used sample fluid from the cup and snap the 100mL bottle cap tightly closed immediately.
Pro Tips:
- Never Dip Probes Directly Into the 100mL Bottle. Even a single drop of residual RO/DI rinse water or aquarium saltwater clinging to a probe housing will dilute or concentrate the remaining solution inside the 100mL bottle, permanently corrupting future calibrations. Always dispense a small working portion into a clean glass vial or plastic sample cup, perform your calibration, and discard the used fluid down the drain.
- Temperature-Match Solutions and Eliminate Trapped Bubbles. Conductivity varies noticeably with temperature, and tiny air bubbles clinging to the internal carbon or platinum electrodes of a K-10 probe will artificially insulate the sensor, causing falsely low salinity readings. Always bring your 28 ppt and 35 ppt bottles to the same temperature prior to calibration, and tap or swirl the probe vigorously while submerged in the sample cup to release trapped air before locking in your calibration value.