Dräger Polytron® 8720 IR

The Dräger Polytron® 8720 IR is an advanced explosion proof transmitter for the detection of carbon dioxide in percent volume or ppm. It uses a high performance infrared Dräger PIR 7200 sensor, which can be submerged in water without damage. Besides a 3 wire 4 to 20 mA analogue output with relays, it also offers HART®, Modbus and Fieldbus making it compatible with most control systems.

Carbon Dioxide Detector

  • Sensor: IR Sensor
  • Installation: Increased Safety or flameproof
  • Interface: 4-20 mA, Relays, Bus, HART ®
  • IP class: IP65/66/67 and SIL2
  • Special: Display

Efficient, stable and robust – the Dräger PIR 7200

With its stainless steel 316L enclosure and drift free optics, the Dräger PIR 7200 is built for the harshest industrial and commercial outdoor environments. The unique 4 beam signal stabilizing system makes the sensor resistant to dust or dirt deposits on the optical surfaces. Environmental and ageing effects are compensated ensuring long term, drift free operation. The measuring range can be freely adjusted between 0 – 2,000 ppm and 0 – 30 % volume enabling a wide variety of applications.

Easy device management via digital communication

The Dräger Polytron 8720 is equipped with digital interfaces allowing for quick and easy remote interrogation of the transmitter’s state. Integration with existing asset management systems such as PACTware is possible via DTM. In addition to the common HART® communication system, the fieldbus interfaces PROFIBUS® PA, FOUNDATION fieldbus H1, and Modbus RTU are also available.

Same design, same operating principle

The Dräger Polytron 8720 belongs to the Polytron 8000 series. All transmitters in this series have the same design and user interface. This allows for uniform operation with reduced training and maintenance requirements. The large graphic backlit display shows status information clearly and in an easy to use format. The measured gas concentration, selected gas type, and measuring unit are displayed during normal operation. Colored LEDs (green, yellow and red) provide additional alarm and status information. The Polytron 8720 is operated by means of a magnetic wand over contact surfaces.

Three relays for controlling external equipment

Upon request, the Dräger Polytron 8720 can also be supplied with three integrated relays. This enables you to use it as an independent gas detection system with two arbitrarily adjustable concentration alarms and one fault alarm. Audible alarms, signal lights or similar devices can thus be controlled locally without an additional cable between the transmitter and central controller.

Safe, robust housing for every application

Polytron 8720 features a Class I, Div. 1 rated explosion proof enclosure made from aluminium or stainless steel, making it suitable for a wide range of environmental conditions. A protection type “e” version includes a convenient docking station which allows installation in hazardous atmospheres without running conduit (where approved) and this also facilitates pre-assembly.

Make the impossible possible with the remote sensor

The remote sensor connection housing allows you to install the sensor separately from the transmitter. This allows you to simply place the sensor closer to the gas cloud in hard-to-reach locations. The display remains visible at eye level. Since the sensor is connected via an intrinsically safe connection, no conduit cabling is required. The connection also allows 'hot replacement' of the sensor in the hazardous area.

Data logger

The Polytron 8720 has a data logger, which records measuring and event data from the past years.

Downloads

Polytron 8720 IR Product Information, en
Polytron 8720 IR Product Information, en

The Dräger Polytron® 8720 IR is an advanced explosion proof transmitter for the detection of carbon dioxide in percent volume or ppm. It uses a high performance infrared Dräger PIR 7200 sensor, which can be submerged in water without damage. Besides a 3 wire 4 to 20 mA analogue output with relays, it also offers HART®, Modbus and Fieldbus making it compatible with most control systems.

Download

More than the sum Brochure, en
More than the sum Brochure, en

Dräger is a successful global player in the field of stationary gas measuring technology since more than 70 years. We have been developing gas measuring products, setting new standards for measuring accuracy, durability and customer-specific adaptation.

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Explosion Protection Brochure, en-master
Explosion Protection Brochure, en-master

Detecting flammable gases and vapours before they become a hazard takes priority over mechanical and electrical explosion-protection measures.

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Brochure: Digital Communication (PDF)
Gas List Brochure, en
SIL Brochure, en
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Technical Data

Key Facts

Type
Transmitter
Response time
<= 8 seconds
Cable entry
M20 or 3/4" NPT
Display
Intrinsic Safety
Flameproof
Increased Safety
SIL
✓ (SIL 2)
4-20 mA
Bus
HART®

Technical Data

Power Supply
10 to 30 VDC, 3-wire
Temperature (operation)
-40°C - 77°C
Humidity
0 to 100% r.h., non-condensing
Pressure (hPa)
700 - 1300
Dimensions (H × W × D)
0.28x0.15x0.13 m
Weight
12.57 lb
Housing Material
Epoxy coated copper-free aluminum or stainless steel SS316 L
Degree of protection (IP class)
IP65/66/67

Approvals

ATEX
IECEx
UL
CSA
CE marking
GOST (EAC)
Performance approval
Shipping approval

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+44 (0) 1670 352 891

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Unit 2 Tern Pl, Bridge of Don
Aberdeen, AB23 8JX
+44 (0) 1224 701 569