Page 51 - FoodFocusThailand No.189 December 2021

STAND OUT TECHNOLOGY

Improvements in measurement performance
The newest pH sensor launched recently is the first pH sensor to
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feature the high technology chip . It has a pre-pressurized liquid
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electrolyte which ensures accurate and consistent measurement
throughout the sensor’s lifetime. พฤติกรรม่อ่ดม่คติตาม่
Because the measurement principle in the newly launched pH สิม่การของ Nernst
sensor is the same as for traditional glass pH sensors, the new design
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has a linear measuring range that spans from pH 0 to 14 with a
theoretical slope of – 59.16 mV / pH at 25 °C, as defined by the Nernst
equation (Figure 2). Temperature compensation is also based on the
same theoretical principle as glass-bulb electrodes.
As mentioned, one of the sources of drift in traditional pH sensors
is the inner buffer solution. Over time, the solution reacts chemically
with the pH-sensitive glass, causing a shift in the chemical composition ภาพิ่ที่่� 2: ประสิิทธิิภาพในการตรวจวัดของอิเล็็กโทรดในเซนเซอร์ร่�นใหม่�ล็�าสิ่ด พร้อม่
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of the buffer and resulting in a drift in the measurement signal. This อิเล็็กโทรไล็ต์เหล็วท่�ปรับความ่ดันล็�วงหน้า
phenomenon is negligible at low temperatures but its kinetics, and Figure 2: Measurement performance of the newly launched pH sensor’s electrode 2
therefore measurement error, becomes relevant at high temperatures. with pre-pressurized liquid electrolyte.
There is no inner buffer in the latest pH sensor , so it exhibits much
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lower drift at elevated temperatures. Due to the significantly reduced for regular calibration has been associated with increased operating
drift, sensor calibration intervals can be extended by up to 50 %, allowing costs. The unique design of the latest pH sensor with high technology
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cost savings in human intervention and maintenance. chip provides an exclusive solution to both issues. It offers worry-free,
High Temperature Tolerant high accuracy pH measurement in food and beverage applications
Contrary to available glass-free pH technologies, the latest pH sensor 2 where glass-bulb sensors have previously been unsuitable.
is resistant to cleaning-in-place (CIP) procedures. In applications where
CIP is used daily, the latest pH sensor can be installed without the
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need for expensive retractable equipment, offering the same degree More Information Service Info C009
of process safety as non-glass sensors but with improved measurement
performance. ข้้อมููลเพิ่่�มูเติ่มู / Additional Information
The fragility of traditional glass pH sensors has prevented them 1 METTLER TOLEDO’s X-Chip Technology
from being used more widely than they currently are, and their need 2 METTLER TOLEDO’s InPro X1, the first pH sensor to feature X-Chip technology

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