Description
Explosion-proof differential pressure sensors ΔP for Zone 2 and 22
The RedCos-P250 is an explosion-proof and highly accurate differential pressure sensor, designed for measuring low pressure differences in HVAC, process, and industrial applications. This sensor is certified according to ATEX and IECEx for use in zones 2 (gas) and 22 (dust).
Thanks to the measuring range of ±250 Pa, 24 VAC/DC power supply, and selectable output (0–10 V or (0)4–20 mA), the RedCos-P250 offers a reliable and flexible solution for demanding environments where safety and accuracy are paramount.
The compact IP66 housing with integrated Ex-e terminal box, illuminated display and intuitive three-button operation makes installation and commissioning simple and safe. Optionally, the RedCos-P250 is available with an offshore or stainless-steel housing (CT, OCT, VA, OVA), specially for corrosive or humid locations such as chemical plants, petrochemical plants, power stations and offshore platforms.
Key features
- ATEX- and IECEx-certified for Zone 2 (gas) and 22 (dust)
- Measuring range ±250 Pa, adjustable to at least 20 % of the full-range span (50 Pa)
- Selectable output: 0–10 V or (0)4–20 mA
- Power supply 24 VAC/DC (±20 %), with galvanic isolation between input and output
- High accuracy: typically < ±1 % of final value
- IP66 housing against dust, moisture and vibration
- Illuminated display with 3 buttons and password protection
- Housing options: aluminum, CT/OCT (offshore) or VA/OVA (stainless steel)
- Operating temperature: −20…+50 °C
- Low-maintenance and suitable for continuous use in explosion-proof environments
Technical data
| Type | RedCos-P250 |
| Measuring principle | Differential pressure, internal piezoelectric sensor |
| Measuring range | ±250 Pa; minimum adjustable range 20 % (50 Pa) |
| Power supply | 24 VAC/DC ±20 % (19,2…28,8 V), 50/60 Hz |
| Output signal | 0–10 V or (0)4–20 mA, locally selectable; invertible |
| Degree of protection | IP66 |
| Explosion protection | ATEX 2014/34/EU & IECEx, zones 2 (gas) and 22 (dust) |
| Accuracy | Typically < ±1 % of reading; Max. ±2 % of reading ± 1 Pa; T90 ≈ 5 s |
| Temperature range | −20…+50 °C (operating); −35…+70 °C (storage) |
| Housing | Aluminum (coated); options: CT/OCT (offshore), VA/OVA (stainless steel) |
| Pressure connections | P+/P− nipples Ø 4–6 mm; OCT/OVA: stainless-steel tube connections Ø 6 mm |
| Cable connections | 2× M16 (standard); VA/OCT/OVA: 2× M20 Ex-e cable glands |
| Dimensions/weight | Alu: approx. 180×107×66 mm / ~950 g; stainless steel: approx. 195×127×70 mm / ~2,5 kg |
Frequently asked questions (FAQ)
For which explosion hazard areas is the RedCos-P250 certified?
The sensor is approved according to ATEX and IECEx for use in zones 2 (gas) and 22 (dust).
Can the output be set locally?
Yes, via the internal menu you can choose between 0–10 V or (0)4–20 mA and optionally invert the output.
Is the RedCos-P-250 suitable for outdoor or offshore installations?
Certainly. With IP66 protection and an optional offshore or stainless-steel housing, the sensor functions reliably under harsh conditions.
What is the smallest adjustable measuring range?
The minimum adjustable range is 20 % of the full range, so 50 Pa for this version.
Which accessories are available?
Various accessories such as mounting brackets, pressure hoses, stainless-steel connection kits, Ex cable glands and weather shields are available.
Do you have any questions or would you like more information? contact us! You can do so by telephone, email or via the chat function.
Available versions RedCos-P | 100 Pa…7.500 Pa | Zone 2, 22
| Type | Max. range | Min. range | Max. pressure | Technical data | Certificate | EC declaration |
| RedCos-P100 | ± 100 Pa | 20 Pa | 25.000 Pa |  | | |
| RedCos-P250 | ± 250 Pa | 50 Pa | 25.000 Pa | | | |
| RedCos-P500 | ± 500 Pa | 100 Pa | 50.000 Pa | | | |
| RedCos-P1250 | ± 1250 Pa | 250 Pa | 50.000 Pa | | | |
| RedCos-P2500 | ± 2500 Pa | 500 Pa | 50.000 Pa | | | |
| RedCos-P5000 | ± 5000 Pa | 1000 Pa | 75.000 Pa | | | |
| RedCos-P7500 | ± 7500 Pa | 1500 Pa | 120.000 Pa | | | |
Scope of delivery – RedCos-P ..
1 × Analog sensor RedCos-P with integrated Ex-e terminal box
3 × Self-tapping screw Ø 4,2 × 13 mm
1 × Short-circuit tube ~ 140 mm length
Special models – RedCos-P ..- A
Module with one intrinsically safe 4..20 mA output for connecting an external actual-value indicator
Special model in stainless steel – RedCos-P -…- VA
Stainless-steel housing comparable to AISI 316, some parts nickel-plated
Special model in stainless steel – RedCos-P -…- OVA
Offshore version with aluminum housing, pressure connection and screws
in seawater-resistant robust stainless steel (comparable to AISI 316), M20 cable glands nickel-plated
Special model painted (coated) – RedCos-P -…- CT
Aluminum housing offshore / marine coated, seawater-resistant, cable glands nickel-plated, screws in stainless steel
Special model painted (coated) – RedCos-P -…- OKT
Offshore version with aluminum housing offshore / marine coated, seawater-resistant, cable glands nickel-plated, tubes for compression fittings
Ø 6 mm and screws in stainless steel
Accessories – RedCos-P
- Intrinsically safe external LCD indicator connectable to RedCos-P ..- A sensors, installation in hazardous locations Zone 2, 22
- Mounting bracket for round air ducts up to Ø 600 mm
- Mounting set with 2 m flexible pressure hose Ø 6 mm
- Stainless-steel pressure tube connection for 6 mm compression fittings
- M16 standard cable glands in nickel-plated brass
- M20 Ex-d cable glands in nickel-plated brass for armored cables
- (Offshore applications)
Heating system ExPolar for use with RedCos sensors at low temperatures down to −40 ° C
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