Hanna Instruments HI-4004 Calcium Half-Cell ISE
The HI-4004 is a liquid membrane, half-cell ion selective electrode (ISE) for the determination of calcium (Ca2+) in solution.
The PVC membrane comprised with organic ion exchanger produces a potential change due to the calcium ion exchange between the organic polymer membrane and the sample. The internal sensing elements are housed within a durable epoxy body.
The HI-4004 is ideal for a variety of applications in the food and beverage industry and water analysis.
- Liquid membrane sensor
- Detection from 0.12 to 40,080 mg/L Ca2+
- For use with HI5315 reference half-cell
- 1m cable and BNC connector
The HI-4004 is a liquid membrane, half-cell Ion Selective Electrode (ISE) for the detection of calcium (Ca2+) in solution. The PVC membrane comprising an organic ion exchanger produces a potential change due to the calcium ion exchange between the organic polymer membrane and the sample. The internal sensing elements are housed within a durable epoxy body.
The HI-4004 calcium ion selective electrode is a potentiometric half-cell sensor housed within an epoxy body. The internal elements are isolated from the sample by an organic polymer sensing PVC membrane. This liquid membrane sensor requires a separate reference electrode to complete the measurement system.
Hanna’s liquid membrane half-cell ISEs are designed for use with the HI-5315 reference half-cell. The reference half-cell features a cone style junction. The skirted cone geometry of the sensor forms the liquid junction with the test solution at the tip of the junction cone, producing a highly stable reference potential and consistent flow rates of electrolyte into the solution. A simple press of the top portion of the ISE makes it easy to empty the electrolyte fill solution and replace when necessary.
For the HI-4004 to measure calcium accurately, it is important that the ionic strength of the standards and sample be adjusted to a high and constant value with the calcium ionic strength adjuster (ISA) solution. The ISA ensures that the activity coefficient is constant so the concentration of free calcium ions can be measured. Measuring all solutions with a constant ionic strength reduces the margin of error between measurements. The HI-4004 calcium liquid membrane ISE can measure from 3µM (0.12 mg/L) to 1M (40,080 mg/L).
Specifications
| Parameter | Calcium |
| Type | Polymer Membrane; Half-cell |
| Measurement Range | 1M to 3X 10-6M 40080 to 0.12 ppm |
| Optimum pH Range | 4 to 10 |
| Temperature Range | 0 to 40°C |
| Approximate Slope | +28 |
| Body O.D. | 12 mm |
| Insertion Length | 120 mm |
| Body Material | PVC |
| Cable | 1m coaxial |
| Connector | BNC |
| Possible Applications | Determination of free calcium in beverages, water, and seawater |
Frequently Asked Questions
Clear answers to help you choose the right water testing solution with confidence
Which brands of water testing kits do you supply?
Do you provide kits for both home and professional use?
Yes — whether you’re a pool or spa owner, aquarium keeper, utility company, or a university laboratory, we have the right solution for your needs.
Can I arrange servicing or calibration for my photometer?
Absolutely. We also provide servicing and calibration to keep your photometers accurate and reliable.
How quickly do you dispatch orders?
Orders placed before 2:30 pm (Monday–Friday) are dispatched the same day. We also ship on Saturdays for your convenience.
Which couriers do you use for delivery?
We deliver through UPS, DPD, and Royal Mail. You can also choose to upgrade to next-day delivery at checkout.
What is your return policy?
We accept returns within 14 days of delivery provided the items are unused, in their original packaging, and in resalable condition. Please contact our team before returning any items.
Can I place bulk or business orders?
Yes, we welcome bulk, trade, and institutional orders. For tailored pricing or large quantities, please get in touch with us directly.
How can I get help if I’m unsure which kit to buy?
You can call us at 📞 +44 (0)115888 2726 and our team will guide you in choosing the most suitable kit for your needs.