Ceraphant PTC31B

Summary

Product Identification

• Product Line: Endress + Hauser Pressure Measurement
• Model: Ceraphant PTC31B, PTP31B
• Type: Pressure switch for safe measurement and monitoring of absolute and gauge pressure.

Application

The Ceraphant is a pressure switch for measuring absolute and gauge pressure in gases, vapors, liquids, and dust. It features a wide range of approvals and process connections for international use.

Benefits

• High reproducibility and long-term stability
• Reference accuracy: up to 0.3%
• Customized measuring ranges with a turn down ratio up to 5:1
• Sensor for measuring ranges up to 400 bar (6,000 psi)
• Housing and process isolating diaphragm made of 316L
• Optional IO-Link compatibility

Input

Measured Variable

• Gauge pressure or absolute pressure

Measuring Range

Ceramic Process Isolating Diaphragm (PTC31B):

• Gauge Pressure: 0 to +100 mbar (0 to +1.5 psi) up to 0 to +40 bar (0 to +600 psi)
• Absolute Pressure: 0 to +100 mbar (0 to +1.5 psi) up to 0 to +40 bar (0 to +600 psi)

Metal Process Isolating Diaphragm (PTP31B):

• Gauge Pressure: 0 to +400 mbar (0 to +6 psi) up to 0 to +400 bar (0 to +6,000 psi)
• Absolute Pressure: 0 to +400 mbar (0 to +6 psi) up to 0 to +400 bar (0 to +6,000 psi)

Turn Down

• Ceramic:
  • Gauge Pressure: TD 1:1 to TD 5:1 for ranges other than 6, 16, or 25 bar.
  • Absolute Pressure: TD 1:1 for 100, 250, and 400 mbar; TD 1:1 to TD 5:1 for other ranges.
• Metal:
  • Gauge Pressure: TD 1:1 to TD 5:1 for ranges other than 400 mbar, 1, 2, 4, 10, or 40 bar.
  • Absolute Pressure: TD 1:1 for 400 mbar, 1, and 2 bar; TD 1:1 to TD 5:1 for other ranges.

Output

Output Signal Options

• PNP switch output (3-wire) (not with IO-Link)
• 2 x PNP switch output (4-wire), IO-Link
• 1 x PNP switch output + 4 to 20 mA output (4-wire), IO-Link
• IO-Link (c/Q output for communication in SIO mode)

Range of Adjustment

• Switch Output:
  • Switch point (SP): 0.5 to 100% of URL (min. 1 mbar for some ranges)
  • Switchback point (RSP): 0 to 99.5% of URL (min. 1 mbar for some ranges)
  • Minimum distance between SP and RSP: 0.5% URL
• Analog Output:
  • LRV and URV can be set within the sensor range (LRL - URL).
  • Turn down up to 5:1 of the upper sensor limit (URL).

Switching Capacity

• Switch state ON: Ia ≤ 250 mA
• Switch state OFF: Ia ≤ 1 mA
• Switch cycles: >10,000,000
• Voltage drop PNP: ≤ 2 V
• Maximum capacitive load: 14 μF (1 μF for IO-Link)

Signal Range 4 to 20 mA

• 3.8 mA to 20.5 mA

Load Resistance (Analog Output)

Maximum load resistance (RL) depends on the supply voltage (UB) and is calculated by RLmax ≤ (UB - 6.5V) / 23mA.

Signal on Alarm (4 to 20 mA)

• Alarm current FCU "MIN": Lower alarm current (≤ 3.6 mA)
• Alarm current FCU "MAX" (factory setting): Upper alarm current (≥ 21 mA)
• Alarm current FCU "HLD" (HOLD): Last measured current value is held.

Dynamic Behavior

• Analog electronics: Dead time (t1) 7 ms, Time constant (T63) 11 ms, Time constant (T90) 16 ms.
• PNP switch output: Response time ≤ 20 ms.

Damping

• Continuously adjustable via local display: 0 to 999.9 s
• Factory setting: 2.0 s

Power Supply

• Supply Voltage: 10 to 30 V DC
• Supply Voltage (IO-Link): 10 to 30 V DC (IO-Link communication guaranteed if supply voltage is ≥ 18 V)
• Current Consumption (Intrinsic): ≤ 60 mA
• Current Consumption (IO-Link): Maximum ≤ 300 mA
• Alarm Current (Analog Output): ≥ 21 mA (factory setting); ≤ 3.6 mA (optional)

Electrical Connection

• Degree of Protection: IP66/67, IP65/67, or IP65 depending on connection type (Cable, M12 plug, Valve plug).
• Cable Specification: For valve plugs, < 1.5 mm² (16 AWG) and Ø4.5 to 10 mm (0.18 to 0.39 in).
• Residual Ripple: Operates within reference accuracy up to ±5% of the residual ripple of the supply voltage.
• Influence of Power Supply: ≤ 0.005 % of URL/1 V.
• Overvoltage Protection: Meets requirements of EN 61000-4-5 (1kV EMC wire/ground) despite lacking specific overvoltage protection elements.

Performance Characteristics (Ceramic Process Isolating Diaphragm)

Reference Operating Conditions

• Ambient temperature: +21 to +33 °C (+70 to +91 °F)
• Humidity: 5 to 80 % rH
• Ambient pressure: 860 to 1,060 mbar (12.47 to 15.37 psi)
• Installation position: Horizontal ±1°
• Zero based span

Measuring Uncertainty (Small Absolute Pressure Ranges)

• 1 to 30 mbar (0.0145 to 0.435 psi): 0.4 % of reading
• < 1 mbar (0.0145 psi): 1 % of reading

Resolution

• Current output: min. 1.6 μA
• Display: Adjustable

Reference Accuracy

• PTC31B - Standard: ±0.5% of calibrated span (Non-linearity ±0.1%, Non-repeatability ±0.1%)
• PTC31B - Platinum: ±0.3% of calibrated span (Non-linearity ±0.1%, Non-repeatability ±0.1%)

Thermal Change

• < 1 bar: Zero output: <1% (at -20 to +85°C), <1.2% (at -40 to -20°C or +85 to +100°C). Span: <0.8% (at -20 to +85°C), <1% (at -40 to -20°C or +85 to +100°C).
• ≥ 1 bar: Zero output: <0.8% (at -20 to +85°C), <1% (at -40 to -20°C or +85 to +100°C). Span: <0.8% (at -20 to +85°C), <1% (at -40 to -20°C or +85 to +100°C).

Long-Term Stability

• 1 year: ±0.2% of URL
• 5 years: ±0.4% of URL

Switch-On Time

• ≤ 2 s

Performance Characteristics (Metal Process Isolating Diaphragm)

Reference Operating Conditions

• Ambient temperature: +21 to +33 °C (+70 to +91 °F)
• Humidity: 5 to 80 % rH
• Ambient pressure: 860 to 1,060 mbar (12.47 to 15.37 psi)
• Installation position: Horizontal ±1°
• Zero based span

Measuring Uncertainty (Small Absolute Pressure Ranges)

• 1 to 30 mbar (0.0145 to 0.435 psi): 0.4 % of reading
• < 1 mbar (0.0145 psi): 1 % of reading

Resolution

• Current output: min. 1.6 μA
• Display: Adjustable

Reference Accuracy

• PTP31B - Standard: ±0.5% of calibrated span (Non-linearity ±0.1%, Non-repeatability ±0.1%)
• PTP31B - Platinum: ±0.3% of calibrated span (Non-linearity ±0.1%, Non-repeatability ±0.1%)

Thermal Change

• < 1 bar: Zero output: <1% (at -20 to +85°C), <1.2% (at -40 to -20°C or +85 to +100°C). Span: <0.8% (at -20 to +85°C), <1% (at -40 to -20°C or +85 to +100°C).
• ≥ 1 bar: Zero output: <0.8% (at -20 to +85°C), <1% (at -40 to -20°C or +85 to +100°C). Span: <0.8% (at -20 to +85°C), <1% (at -40 to -20°C or +85 to +100°C).

Long-Term Stability

• 1 year: ±0.2% of URL
• 5 years: ±0.4% of URL

Switch-On Time

• ≤ 2 s

Installation

Installation Conditions

• Prevent moisture ingress into the housing during mounting, connection, and operation.
• Point cables and connectors downwards where possible.

Influence of Installation Position

Any orientation is possible, but may cause a zero point shift. This shift can be corrected on the device.

• PTP31B: Up to +4 mbar upwards, Up to –4 mbar downwards.
• PTC31B (< 1 bar): Up to +0.3 mbar upwards, Up to –0.3 mbar downwards.
• PTC31B (≥ 1 bar): Up to +3 mbar upwards, Up to –3 mbar downwards.

Mounting Location

• Gases: Mount with shutoff device above tapping point for condensate drainage.
• Vapors: Use a siphon; mount preferably with shutoff device and siphon below tapping point.
• Liquids: Mount with shutoff device and siphon below or at the same height as the tapping point.
• Level Measurement: Install below the lowest measuring point; avoid filling curtain, tank outlet, pump suction area, or agitator pressure pulse zones.

Mounting Instructions for Oxygen Applications

• Devices suitable for gaseous oxygen applications must be cleaned per BAM requirements.
• Observe maximum temperature and pressure limits for oxygen.
• PTC31B: Max. pressure 40 bar (600 psi), Temperature range –10 to +60 °C (+14 to +140 °F) (Option HB).

Environment

Ambient Temperature Range

• PTC31B/PTP31B: –20 to +70 °C (–4 to +158 °F)
• IO-Link: –40 to +70 °C (–40 to +158 °F) (Note: Restrictions in optical properties may occur at temperature limits.)

Storage Temperature Range

• –40 to +85 °C (–40 to +185 °F)

Climate Class

• Class 3K5 (as per IEC 721-3-3, with condensation not possible)

Degree of Protection

• IP66/67 or IP65 depending on connection type and cable length.

Vibration Resistance

• Guaranteed for 5 to 2000 Hz: 0.05 g²/Hz (IEC 60068-2-64:2008)

Electromagnetic Compatibility

• Interference emission and immunity as per EN 61326-1 (industrial environment).
• NAMUR recommendation EMC (NE21) (not for devices with IO-Link).
• Maximum deviation: 1.5% with TD 1:1.

Process

Process Temperature Range

• Ceramic Process Isolating Diaphragm (PTC31B): –25 to +100 °C (–13 to +212 °F)
  • Seal options influence temperature range (e.g., FKM: –20 to +100 °C).
• Metallic Process Isolating Diaphragm (PTP31B): –40 to +100 °C (–40 to +212 °F)

Pressure Specifications

• MWP (Maximum Working Pressure): Specified on the nameplate; valid for unlimited time at +20 °C (+68 °F). Observe temperature dependency.
• OPL (Over Pressure Limit): Temporary application; may be limited by process connection OPL.

Mechanical Construction

Materials in Contact with Process

• PTC31B: Housing 316L (1.4404), Process connections 316L, Process isolating diaphragm Al₂O₃ aluminum-oxide ceramic (Ceraphire®, 99.9% ultrapure).
• PTP31B: Housing 316L (1.4404), Process connections 316L (1.4404), Process isolating diaphragm AISI 316L (1.4435).

Disclaimer

Extraction may miss figures, footnotes, or revisions; contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror