Threshold gas detectors DEX/A
ATEX compliant, threshold detectors of toxic and combustible gases (also oxygen and Freon HFC) with 4-20mA connectivity
DEX/A detectors are designed to detect the presence of dangerous concentrations of gases or vapours of explosive or toxic liquids or oxygen. They signal exceeding two alarm thresholds (A1, A2) set in an interchangeable sensor module (thresholds set at the production stage). They have a 3-wire interface type 4-20mA (passive - absorbing current).
DEX/A detectors are designed to work with:
- measuring and threshold control units of type MDP-1.A/T, MDP-1 PLUS, MDP-4, MDP-8, MDP-16;
- addressable control units of type MDD-1, MDD-1/T, MDD-1x/T;
- selected, threshold control units of type MD-1;
- any other control panels accepting the 4-20mA input line standard (with current emission) after using a power limiter type MDPL1.
They are designed to cooperate with measuring control units of MDP family (and with selected models of MD-1, MDD-1/T and MDD-1x/T). After applying power limiter type MDPL1 (optional), they can also cooperate with other any control panels accepting standard 4-20mA input lines (with current emission).
The detectors meet the essential requirements of Directive 2014/34/EU (ATEX) of the European Parliament and of the Council of 26 February 2014, on the harmonization of the laws of the Member States relating to protective systems intended for use in potentially explosive atmospheres, implemented by the Regulation of the Minister of Development on requirements for equipment and protective systems intended for use in potentially explosive atmospheres of 6 June 2016. (Journal of Laws 2016 item 817).
The detectors are devices with explosion-proof construction of flameproof cover type and can be used in zones 1 or 2 threatened with explosion of flammable gases or vapors classified as explosiveness group IIA, IIB or IIC, temperature classes T1, T2, T3, T4, T5 or T6.
Offered models
| Model | Gas sensor module | Sensor | Substance/property | Standard alarm thresholds or measuring range | Supply voltage | Net price | C.g. | ||
|---|---|---|---|---|---|---|---|---|---|
| DEX-A12/N |
|
MS-12/N | Semiconductor |
Methane (CH4) |
10/30 |
%LEL |
System powered | PLN919.00 | N |
| DEX-A14/N |
|
MS-14/N | Semiconductor |
Methane (CH4) |
10/30 |
%LEL |
System powered | PLN919.00 | N |
| DEX-A15/N |
|
MS-15/N | Semiconductor |
Liquefied petroleum gas (LPG) |
10/30 |
%LEL |
System powered | PLN919.00 | N |
| DEX-A31/N |
|
MS-31/N-X | Semiconductor |
Organic compounds |
20/40 |
%LEL |
System powered | PLN1,299.00 | N |
| DEX-A41/N |
|
MS-41/N-X | Semiconductor |
Ammonia (NH3) |
500/1500 |
ppm |
System powered | PLN1,099.00 | N |
| DEX-A73/N |
|
MS-73/N-X | Semiconductor |
Hydrogen (H2) |
10/30 |
%LEL |
System powered | PLN1,099.00 | N |
| Model | Gas sensor module | Sensor | Substance/property | Standard alarm thresholds or measuring range | Supply voltage | Contact control outputs | Voltage control outputs 12VDC | Two-state outputs (threshold) | Control output "Fault" | Output controlling the shut-off valve | Output in 4-20mA standard | Output in 0-10V standard | Output in 2-10V standard | Output in RS-485 standard | Visual signalling, built-in | Acoustic signaling, built-in | Internal battery | Dimensions | Net price | C.g. | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DEX-A12/N |
|
MS-12/N | Semiconductor |
Methane (CH4) |
10/30 |
%LEL |
System powered | — | — | 2 | — | — | ✓ | — | — | — | — | — | — | 105 x 103 x 54 mm | PLN919.00 | N |
| DEX-A14/N |
|
MS-14/N | Semiconductor |
Methane (CH4) |
10/30 |
%LEL |
System powered | — | — | 2 | — | — | ✓ | — | — | — | — | — | — | 105 x 103 x 54 mm | PLN919.00 | N |
| DEX-A15/N |
|
MS-15/N | Semiconductor |
Liquefied petroleum gas (LPG) |
10/30 |
%LEL |
System powered | — | — | 2 | — | — | ✓ | — | — | — | — | — | — | 105 x 103 x 54 mm | PLN919.00 | N |
| DEX-A31/N |
|
MS-31/N-X | Semiconductor |
Organic compounds |
20/40 |
%LEL |
System powered | — | — | 2 | — | — | ✓ | — | — | — | — | — | — | 105 x 103 x 54 mm | PLN1,299.00 | N |
| DEX-A41/N |
|
MS-41/N-X | Semiconductor |
Ammonia (NH3) |
500/1500 |
ppm |
System powered | — | — | 2 | — | — | ✓ | — | — | — | — | — | — | 105 x 103 x 54 mm | PLN1,099.00 | N |
| DEX-A73/N |
|
MS-73/N-X | Semiconductor |
Hydrogen (H2) |
10/30 |
%LEL |
System powered | — | — | 2 | — | — | ✓ | — | — | — | — | — | — | 105 x 103 x 54 mm | PLN1,099.00 | N |
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