PH21 pH Sensor with Integral Pt1000 for Accurate Temperature and 0-14 pH Range in 0-60°C Environments

At Yokogawa, we are committed to our responsibility of protecting the environment, and this sensor is the first step to achieving a zero emission future. The PH21 is the first pH sensor made from recycled PPS-GF40 materials without compromising the sensor body integrity. The PH21 was designed with the drinking water market in mind, where simplicity results in accuracy and reliable pH measurement, making this sensor an excellent choice in 80% of water-based applications.
Features and Benefits

• Available as analog and digital SMART sensors (SENCOM)
• Integral Pt1000 element for accurate temperature measurements and enhanced pH accuracy
• Quick disconnect Variopin connector
• Simple maintenance by comprehensive design
• Versatile Direct in-line, immersion, off-line installation (flow fitting) and retractable Hot-tap
• Quick-Release adapter available
• Calibration certificate delivered with each sensor

Measuring elements
pH glass electrode
Silver Chloride reference
Pt1000 temp sensor
Wetted parts
Sensor body: PPS
Measuring sensor: G-Glass
O-ring: Viton
Reference junction: PTFE
Functional specifications (at 25°C)
Isothermal point: pH7
Reference system: Ag/AgCl
Glass impedance: 100-3000 MΩ
Junction resistance: < 1 KΩ
Temperature element: Pt1000 IEC 751
Asymmetry potential: < 5 mV
Linearity pH Slope: ≥96% in pH 2 - 12
Dynamic specifications (at 25°C)
Response time pH step 7 to 4: 15 sec for 90%
Response time temp step, 10°C: 180 sec
Stabilization time (0.02 pH unit 10 s): < 2 minutes
Operating rangepH: 0 - 14 pH
Temperature: 0°C... +60°C (32°F... 140°F)
Pressure (at 25°C): 0 to 5 Bar (0 to 72 PSIG)
Pressure (at 70°C): 0 to 5 Bar (0 to 72 PSIG)
Conductivity: > 50 µS/cm