Brand: Trafag

Trafag EXNA 8854 Ex Pressure Transmitter

Name: Trafag EXNA 8854 Ex Pressure Transmitter – Datasheet & Quote
Brand: Trafag
SKU: EXNA 8854

Description

Wide-temperature intrinsically safe transmitter for Zone 0 gas and Zone 20 dust

The Trafag EXNA 8854 is an intrinsically safe piezoresistive pressure transmitter with a 4 to 20 mA output, certified to ATEX and IECEx for gas Zones 0, 1 and 2, dust Zones 20, 21 and 22 and underground mining. It carries a DNV-GL approval and can be configured for ranges from 0.1 to 1000 bar, in relative or absolute versions.

Compared with the older EXNA 8852/8853 types, the datasheet for the 8854 lists a lower media and ambient limit of minus 40 degrees C and a higher vibration and shock rating. That makes it a candidate for cold-climate and offshore installations, and for pump skids where vibration is a concern. The body, sensor and pressure connection are 316L stainless steel, with a titanium option for corrosive media.

Technical specifications of the EXNA 8854

Parameter	Specification
Manufacturer	Trafag AG, Switzerland
Product code	8854
Measuring principle	Piezoresistive
Measuring range	0 … 0.1 to 0 … 1000 bar, relative or absolute
Output signal / supply	4 … 20 mA; 9 … 28 VDC; load (US – 9 V) / 20 mA
Type of protection	II 1G Ex ia IIC T3 … T6 Ga; II 1D Ex ia IIIC T145 °C Da; I M1 Ex ia I Ma
Zener barrier values	28 V / 93 mA / 0.65 W
Approvals	ATEX, IECEx, DNV-GL; IEC/EN 60079-0, -11, -26 and EN 50303
Media temperature	T3: -40 to +150 °C; T4: -40 to +100 °C; T6: -40 to +50 °C
Ambient temperature	T3: -40 to +125 °C; T4: -40 to +85 °C; T6: -40 to +50 °C
Accuracy NLH at 25 °C	Sensor 02: 0.25 % FS; sensor 01: 0.1 % FS (up to 600 bar)
Rise time	Typically 1 ms (10 to 90 % of nominal pressure)
Protection / humidity	Minimum IP65 / maximum 95 % relative
Vibration / shock	10 g (4 to 2000 Hz) / 100 g, 6 ms
Wetted parts and housing	1.4435 (AISI 316L) or titanium
Sealing	FKM 70 Sh; EPDM / Kalrez option
Weight / torque	About 220 g / 25 Nm

Pressure ranges and overpressure ratings

The type code selects one of 21 standard ranges. A few examples from the datasheet are listed below, and customised ranges can be requested.

Range [bar]	Overpressure [bar]	Burst pressure [bar]
0 … 0.1	3	200
0 … 1	3	200
0 … 10	30	200
0 … 25	75	200
0 … 100	300	850
0 … 250	750	850
0 … 600	850	1500
0 … 1000	1500	1500

For ranges above 600 bar the sensor 01 option is not offered, and the total error band over the temperature range widens at the lowest ranges, so check the accuracy table for 0.1 to 0.5 bar spans.

Connections, options and installation

Process connections are G1/4 female, G1/4 male, G1/2 male, 1/4 NPT male, 1/2 NPT male, and G1/2 male with a frontal or flush membrane. Electrical connections are EN 175301-803-A, Binder 723, MIL-C 26482, M12x1 and PUR or FEP cable. The cable versions need additional measures against static charge for Zone 0 to Zone 20 use, such as an earthed metal braid or conduit.

Accessories include special oil filling, mating plugs, a pressure-peak damping element for selected connections, titanium construction, temperature class selection T3, T4 or T6, and a Zener barrier listed under code F90138.

Choose the temperature class from the process and ambient temperatures together, because the permitted media temperature drops from 150 degrees C at T3 to 50 degrees C at T6. Confirm the barrier or isolator is certified for the entity values, and keep the loop calculation on file. Use the flush membrane version where the medium is viscous or contains solids.

Documents and quotation

The attached document is the Trafag EXNA 8854 Ex pressure transmitter datasheet (H72334e, 09/2024). The mounting and safety instructions and the certificates are published separately by Trafag.

For a quotation, send the full type code or the range, connection, plug, temperature class and accuracy class. Related instruments are listed in Pressure Instrumentation.

Datasheets & Documents

Datasheet Trafag EXNA 8854 Ex Pressure Transmitter datasheet (H72334e) Download

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About brand

Trafag is a Swiss manufacturer of sensors and monitoring devices for pressure, temperature and SF6 gas density, founded in 1942 and based in Bubikon, Switzerland. Its pressure transmitters, pressure switches, temperature transmitters and thermostats are used wherever robust field instruments are needed, including shipbuilding, hydraulics, railways, large engines, water treatment and test benches.

Instruments for hazardous areas

For explosive atmospheres Trafag offers an Ex range that includes intrinsically safe pressure transmitters, submersible level probes, flameproof pressostats and Ex industrial thermostats, with ATEX, IECEx and UKEX certification depending on the model. These instruments suit oil and gas, chemical and marine installations where gas or dust zones must be respected.

Technology and range

The product range spans piezoresistive and thin-film-on-steel pressure sensors, electromechanical and electronic pressure switches, level sensors, temperature gauges, thermostats and accessories such as damping elements. Trafag publishes a datasheet, instructions and certificates for each product family, so zone, accuracy and connection data can be checked before ordering.