Pyrometer without display CellaTemp® PR 21

°Canalog outputIP65

Product overview
The CellaTemp® PR 21 is an infrared thermometer for fast, non-contact, wear-free temperature measurement at a safe distance over the range 250 to 1600 °C.

Key features

• Compact stainless-steel housing, protection class IP65 (Ø 30 x 210 mm)
• Fieldbus-independent IO-Link interface and analogue output 0/4–20 mA
• High optical resolution and measuring accuracy with broadband anti-reflective precision lenses
• Very short response time (≤ 2 ms at T > 600 °C)
• Universally configurable switching output (open collector)
• Easy mounting via M30 central thread

Properties / Version

• Measuring range: 250 - 1600 °C
• Standard focus distance: 1.5 m (typical target size 10 mm)
• Example version: CellaTemp PR 21 AF 1 (target size 10 mm, focus distance 1.5 m)

Measuring field (examples)
The target size depends on measuring distance. Examples: 0 mm → 11.50 mm; 300 mm → 11.20 mm; 1500 mm → 10.00 mm.

Technical Data
Measurement parameters

• Measuring range: 250 - 1600 °C
• Sensor: Photodiode
• Spectral range: 1.0 - 1.7 µm
• Response time (t90): ≤ 2 ms (T > 600 °C)
• Measurement uncertainty: 0.3% of temperature reading + 2.5 K
• Repeatability: 1 K
• Resolution interface: 0.1 K

Electrical parameters

• Analog output: 0(4) - 20 mA, linear, switchable, scalable
• Load resistance: ≤ 500 Ω
• Switching output: Open Collector 24 V DC, ≤ 150 mA
• Test input: 10 - 34 V DC (acc. to IEC 61131-2)
• Interface: IO-Link
• Power supply: 24 V DC (+10% / -20%)
• Current consumption: ≤ 50 mA (24 V DC)

General parameters

• Connection: M12 screw connection, 4-pin (A-coded)
• Ambient temperature: 0 - 65 °C
• Storage temperature: -20 - +80 °C
• Permissible humidity: ≤ 95% r.H. (non-condensing)
• Housing: Stainless steel V2A (1.4305), Protection class: IP65
• Dimensions: Ø 30 x 210 mm (without plug); Weight: approx. 0.4 kg

Adjustable parameters

• Analogue output scaling and configuration
• Emissivity setting
• Damping time constant
• Maximum value hold time
• Operation mode and switching point configuration
• Temperature unit °C/°F
• Simulation of temperature and factory reset

Functions

• Overtemperature signalling
• Error and event signalling via the digital interface
• Service function: measured value simulation
• Reverse polarity protection for power supply, analogue output and switching output

Scope of delivery

• Infrared thermometer CellaTemp PR 21
• Short manual
• 2 fixing nuts

Technical specifications

• Brand: Keller
• Model: CellaTemp® PR 21
• Measuring range: 250 - 1600 °C
• Spectral range: 1.0 - 1.7 µm
• Response time (t90): ≤ 2 ms (T > 600 °C)
• Accuracy: 0.3% of reading + 2.5 K
• Interface: IO-Link (fieldbus-independent)
• Analogue output: 0(4)-20 mA
• Switching output: Open Collector 24 V DC, ≤ 150 mA
• Power supply: 24 V DC (+10% / -20%)
• Connection: M12, 4-pin
• Housing: Stainless steel V2A (1.4305), IP65
• Dimensions: Ø 30 x 210 mm (without plug)
• Weight: approx. 0.4 kg
• Typical target size (example): 10 mm at 1.5 m focus