Solutions and spare parts

Components in contact with the measured medium always wear out to a greater or lesser extent. Long-term accurate and reliable measurement therefore requires maintenance. Depending on the type of sensors used, this mainly involves regular calibrations, replacement of worn parts, or entire sensors (where applicable).

You can easily handle a number of these common tasks yourself, saving time and costs. You can find the relevant procedures in the user's manual of the individual products, or we can also advise you over the phone. Below you will find the necessary materials.

Membrane heads for CSOT, CSCT, CSUT, CSDT, CSZT sensors

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Membrane heads of all INSA sensors are easily replaceable. By timely replacement of the worn membrane, the service life of the mentioned sensors can be extended almost indefinitely, if the damage of the previous membrane did not lead to contamination of the sensor's internal system. Membrane heads for amperometric sensors (types MH11 xx for series 43 sensors) must be filled with the corresponding electrolyte prior to assembly. Optical sensor heads (type MH21 for CSOT53 and CSOT63 series sensors) are mounted dry.

A cost-effective alternative to buying a new membrane head is the option of used head repair in our facility.

TypeSuitable forFront protective elements
MH11 O2CSOT43PS, CSOT43PL, CSOT43LPSNo
MH11 O2LCSOT43LS, CSOT43LL, CSOT43LZYes
MH11 C2CSCT43No
MH11 U2CSUT43No
MH11 D2CSDT43No
MH11 Z2CSZT43No
MH21 O2CSOT53, CSOT63No

Electrolyte for CSOT43, CSCT43, CSUT43, CSDT43, CSZT43 sensors

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Electrolyte is used to fill membrane heads for INSA amperometric sensors. The packaging differs (bottle, syringe) according to the consistency and usage of the individual variants.

TypeSuitable for sensorsPackaging
ES43 O2CSOT43Bottle 10 ml, 20 ml
ES43 C2CSCT43Bottle 20 ml
ES43 U2CSUT43Syringe 2 ml
ES43 D2CSDT43Bottle 20 ml
ES43 Z2CSZT43Bottle 20 ml

pH buffers

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Buffers are used for calibration of pH sensors. The IEC (NBS) buffer set pH 4.01 - 6.87 - 9.18 is suitable for basic measurement range. Buffers are supplied in bottle sets 3 x 100 ml, 3 x 500 ml or 3 x 1000 ml, or as separate bottles.

Recommended setOther available buffers
pH 1.68 ± 0.05pH 3.56 ± 0.05
pH 4.01 ± 0.02pH 6.00 ± 0.05
pH 6.87 ± 0.02pH 7.00 ± 0.02pH 7.41 ± 0.02
pH 9.18 ± 0.02pH 10.01 ± 0.05pH 10.90 ± 0.05
pH 11.88 ± 0.05pH 12.83 ± 0.05

Buffers pH 3.56 4.01 6.87 7.41 9.18 are primary IEC (NBS) buffers, 1.68 is primary IEC (NBS) standard for low pH range, 10.01 is supplementary IEC (NBS) standard, 6.00 7.00 10.01 10.90 11.88 12.83 are standardized against IEC using a glass pH electrode. The listed values are valid at 25 °C.

ORP reference solution

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The reference solution is used to calibrate ORP sensors. The listed ORP value is valid at 25 °C, with the Ag/AgCl reference electrode.

Product codeValueBottle sizes
SS ORP 11225 mV100 ml, 500 ml, 1000 ml
SS ORP 12252 mV100 ml, 500 ml, 1000 ml
SS ORP 13468 mV100 ml, 500 ml, 1000 ml

Conductivity calibration solutions

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Solutions of the SS ES 11 series are used for calibration of conductivity sensors. They are supplied in 100 ml, 500 ml or 1000 ml bottles.

Value at 20 °CValue at 25 °C
133 μS/cm147 μS/cm
1278 μS/cm1413 μS/cm
11.67 mS/cm12.88 mS/cm
102.1 mS/cm111.8 mS/cm

These are KCl solutions.

Calibration solutions for ISE measurement

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We can supply calibration solutions for ISE measurements on your request. These are usually packaged in 100 ml, 500 ml or 1000 ml bottles.

  • Ammonium, NH4Cl
  • Lithium, LiCl
  • Sodium, NaCl
  • Potassium, KCl
  • Calcium, CaCl2
  • Barium, BaCl2
  • Nitrate, KNO3
  • Fluoroborate, NaBF4
  • Perchlorate, NaClO4
  • Fluoride, NaF
  • Chloride, NaCl
  • Ammonia, NH4Cl
  • Carbonate, NaHCO3

Auxiliary solutions for pH, ORP and ISE sensors

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We can also supply further auxiliary solutions, useful for maintenance of pH and ORP sensors, or for ISE measurements:

  • Deproteining solution for cleaning pH sensors
  • Non-ionic detergent for cleaning pH sensors
  • Storage solution for pH and ORP sensors
  • Reference solutions and salt bridge solutions
  • Conditioning solutions, Ionic Strength Adjustors for ISE measurements

Cleaning elements (spare parts)

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These elements are spare parts for maintenance of the probes SPO41ME and SPR41ME.

The cleaning elements employed in the SPO41ME and SPR41ME probes keep the active parts of the sensors clean, thus enabling measurements even in the most demanding operating conditions. Depending on the frequency of cleaning, they naturally wear out. The type of cleaning element needs to match the type of sensor used: Membrane sensors with a flat face are cleaned with foam, glass sensors with a brush.

TypeWorking partReference electrode cleaning (side of the sensor)
CE-KRBrushYes
CE-KBrushNo
CE-MRFoamYes
CE-MFoamNo

Input blocks and further spare parts...

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We can also supply various other spare parts. It can be small things, such as screw fittings to mount sensors or various parts of the cleaning mechanism, but after agreement with the customer, we can also send larger parts. But still, in the case of damage to the instrument, we strongly recommend contacting our service.

From the wide range of spare parts, it is worth to mention the input block ED237: It is compatible with the CSOT53 sensor, and with an uncalibrated current loop 4 - 20 mA, so that in combination with our robust industry-oriented probes it can form a stand-alone measuring setup, equivalent to a CSOT63-66 sensor. However, in terms of user comfort, as well as further functionality and outputs, a complete set with the MFD88 analyzer is usually more suitable.