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Stationary detector for VOCs

The Stationary Photoionisation Detector SPID3 is a continuously measuring detector for volatile organic compounds (VOCs) with an ionisation potential < 10.6 eV. The use of new technologies for the light source and the sensor enables a high stability of the measurement and longer maintenance intervals. Automatic purging and automatic calibration are controlled via an integrated activated carbon filter and the sampling circuit. The device is designed for operation in potentially explosive atmospheres.

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Product Specification

Extended measuring rangeNew

A new sensor unit allows three staggered measuring ranges from 20 ppm up to 5 000 ppm (isobutene) with high resolution at low concentrations.

Easy user interface

A graphic display with intuitive user guidance, clear text instructions and step-by-step configuration support the ease of use.

High performance PID lamp

The ionisation source is a hollow cathode lamp with an energy of 10.6 eV. The Ceramic Discharge Channel ensures high stability and a longer lifetime of up to 15 000 hours and more.

Extended service interval

The high stability of the lamp and the special design of the sensor in conjunction with automatic feeding of pollutant-free air through an activated carbon filter results in longer maintenance intervals.

Simple calibration

Even in heavy environment, only one calibration gas is required for the simple menu driven two-point calibration. The applied active carbon filter provides the zero point.

Automatic fresh air setup

For testing and adjusting the zero-point, pollutant-free air is applied via the activated carbon filter periodically through the gas path.

Flexible connections

A wide range of supply voltage, a configurable current loop output, alarm and error relays, a RS485 interface with MODBUS and HART protocol facilitate integration into your system.

Temperature / humidity compensation

The integrated humidity / temperature sensor measures the physical environment data in addition to the sensor signal and compensates their influence on the measuring result.

IECEx / ATEX certification

The SPID3 fulfils the requirements for use in potentially explosive atmospheres and has the appropriate certifications in accordance with ATEX and IECEx.

Technical Data

Detector principle	VUV-Photoionization with 10.6 eV hollow cathode lamp with Ceramic Discharge Channel technology (optional 11.8 eV lamp)
Detection ranges	0 … 2 000 ppm Isobutene * 0 … 20 ppm Isobutene * 0 … 5 000 ppm Isobutene *
Display range	0 … 20 000 ppm, depending on response factor of detected substance
Lower detection limit	R0 – typical 0.05 ppm * R1 – typical 0.005 ppm * R2 – typical 0.5 ppm
Display Resolution	Dynamic up to 0.01 ppm (1 ppb at low range, 0.1 ppm at high range) or raw precision 3 Digits (5 at low range, 2 at high range)
Response time	T90 < 10 s *
Signal integrity	up to 100 ppm typical > 98 % * up to 2 000 ppm typisch > 95 % *
Influence of humidity and temperature	Humidity and temperature compensation at 0 ... 50 °C and 0 … 90 % rH residual effect less than < 10 %
Operating conditions	-10 … 55 °C 0 … 95 % rH, non-condensing
Storage conditions	-20 … 60 °C 0 … 95 % rH, non-condensing
Gas sampling	Integrated diaphragm pump (about 250 ml/min) with flow detection, Sample inlet with dust filter and water protection cap
PID lamp lifetime	10.6 eV: Min. 8 000 h, typical more than 15 000 h 11.8 eV: 4 months from date of delivery
Alarms	2 adjustable alarm levels
Power supply	10 … 28 VDC, max. 4 W, recommended 24 VDC
Signalisation	1 x LED (multicolor) for status and alarms
Relays	3 x SPDT 30 V / 2 A (surge current), 2 x for alarms, 1 x for error (type-dependent)
Analog output	Current loop: 4 … 20 mA, 0 … 5 mA or 0 … 10 mA (type-dependent)
Digital interface	RS485 (MODBUS) (type-dependent); HART (type-dependent)
Calibration	Automatic two-point calibration Zero gas via activated charcoal filter, span gas via sample inlet
Response factors	Selectable built-in response factors, changeable via remote service program
User interface	Graphical monochrome OLED display, touch keys
Dimension, weight	200 mm x 370 mm x 133 mm (L x B x H), about 2200 g
Ingress Protection	IP64, gas inlet with dust and water protection
Warranty	2 years, except for components in gas path and wearing parts
Approvals	ATEX/IECEx Gas: II 2G Ex db IIC T6 Gb -40 °C ≤ Ta ≤ +60 °C EMC directive 2014/30/EU
	* The indicated values were obtained under standardized conditions with 10.6 eV lamp. Test gas was isobutene in synthetic air.

Smart Photoionization Detector Module PIDS3

The Smart Photoionization Module PIDS3 is an OEM module to detect volatile organic compounds with an ionization potential < 10.6eV. With its built-in electronics and microcontroller as well as a combined humidity/temperature sensor, it provides a flexible and easy to use adaptation into your measurement system. The module comes with a built-in linearization and temperature/humidity compensation. Built-in barometric pressure sensors offer later compensation and gas flow monitoring. The RS485 interface allows additional flexibility to choose the right interface for industrial and laboratory applications. The optional analogue 4 … 20 mA output represents the linearized and compensated concentration value in different scaling. The module is available in different measurement ranges, with optional included pump and 4 … 20 mA output and MODBUS.

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