ATEX certified head type sensors
"i" protection concept
with thermocouple or RTD
"CSI" and "CTI" ranges
Such sensors are designed for use in potentially explosive atmospheres in compliance withe the 94/9/CE European Directive.
"i" protection concept - Intrinsic safety - demands that a Zener barrier or a galvanic isolator limits the energy delivered to the circuit in order to prevent any arc or spark from arising.
There are 2 levels of protection:
- "ib": the equipment is able to resist one fault of its safety components. "ib" concept applies to zone 1 or 21 and 2 or 22.
- "ia": the equipment is able to resist two faults of its safety components. "ia" concept is compulsory in zone 0.
Zoning lays under the end user's responsibility. More information about zone classification...
Such temperature sensors are mostly used in surroundings where the reading area is at a distance from the measure taking area. The active part, either a thermocouple or a PT100, is generally protected by a metallic tube or sheath. It is either in direct contact with the measured environment or placed inside a thermowell. Connection is made through a terminal block or a transmitter protected by a connecting head. Different fxation devices (flange or welded or sliding fitting) allow perfect tightness.
Thermocouple: -40°C to +1700°C, according to thermocouple type. More information...
PT100: -200°C to +500°C
Warning: The user must take all precautionary measures to ensure that the calorific transfer of the sensor does not reach the self-ignition temperature of the surrounding gas or dust.
The selected materials as well as the type of fixation must ensure a safe reliable use. The essential features defining the sensor performance are tightness, resistance to vibrations, corrosion, shocks, wear and tear and to any disturbing factors.
Mechanical resistance and response time, which may seem opposite requirements, may be improved by reducing the sheath diameter in the active part.
|sensing element|| - Class A : + 0,15 + 0,002 [t°]
- Class B : + 0,30 + 0,005 [t°]
Reduced tolerances on request
| thermocouple wire tolerances |
as per NF EN 60751 & IEC 751 standards
|sensor|| according to type of assembly:
2, 3 or 4 wires
|tolerances as per UTE 46201 standard|
to reach x% of the temperature scale interval (in seconds)
|Diameter: 6 mm||
Tests carried out without thermowell
(*) as per UTE C46-202 standard, on a 1 x PT100 sensor, 3 wire-assembly, temperature range: –20°C + 100°C.
(**) as per UTE C46-201, on a type K thermocouple, ungrounded hot junction, inconel 600 sheath.
NF EN 60751 IEC 60751
94/9/CE European Directive, Potentially explosive atmospheres
97/23/CE European Directive, Pressure equipment
Whenever requested by specific applications, other applicable standards are also complied with
Cable-type temperature sensors with "i" protection concept may be used in potentially explosive atmosphere provided that the requirements of the 94/9/CE European directive as well as our EC-type examination certificate LCIE 03 ATEX 6427X are complied with. Download certificate...
All our ATEX temperature sensors are also GOST R - NANIO CCVE N° 7454152 certified. Download certificate...
The most common dimensions are:
- Thermic element length: 3, 4.5, 6, 8 mm
- "Lt" length under head:
- "L" length under fitting:
- Extension length:
- Platinum 100 Ohms at 0°C
2, 3 or 4-wire assembly
- Simple or double thermocouple with ungrounded hot junction
types: K, J, T, N, S, E, B, R, C
• solid drilled
• mechanically welded
• magnesium oxide (MgO), standard or high purity
• replaceable or fixed thermic element:
diameters: 3, 4.5, 6, 8 mm
• materials: 301L SS, 316L SS, 310 SS, alloy 600
- PG16 cable gland
- aluminium or stainless steel
- with or without indicator
- screwed or lever lid
- IP54 to IP67
- terminal block
- standard 4-20mA transmitter, protocol Hart or Fiedbus
- welded or adjustable flange
- extension between thermowell and connecting head
- compression fitting
- sealing fitting
- union fitting
- welded fitting
Marking aims at clearly identifying the use limits of the sensor. It must be readable, durable and indestructible:
- stainless steel plate chained on the head
- printed label stuck on the head