HUBA 520 Relative Pressure Transmitter

Huba 520

Features

The compact Type 520 pressure transmitters are based on Huba Control’s advanced thick-film technology, featuring a hermetically welded, seal-free stainless steel

measuring cell. They provide precise measurement of relative pressures up to 1000 bar and offer high burst pressure resistance, reliability, and long-term stability. Type 520 pressure transmitters are suitable for use with liquids and gases, including all common refrigerants and ammonia. This makes them a reliable solution for a wide range of applications, from industrial processes or HVAC systems to railway components. Comprehensive approvals- including EMC with enhanced noise immunity, shock and vibration resistance, as well as certifications such as UL, EN 45545-2, ATEX and IECex confirm its suitability for diverse and safety-critical environments.

• Compact and robust stainless steel design

• Hermetically welded design without seals, no risk of leakage

• Wide variety of connector options

• Time-saving, quick on-site cable assembly with fast cable gland

Applications

Solar heating / Refrigeration systems / CDU / In-Rack CDU / Circulation cooler / Large heat pumps / Water pumps / Water treatment / Mobile hydraulics / Industrial automation

Specification

Product Features
Pressure range	Relative: -1 ... 9 bar Relative: 0 ... 2.5 ... 1000 bar
Accuracy	typ.; max. 0.5% fs (incl. zero point, full scale, linearity, hysteresis and repeatability) Characteristic line a: ± 0.3% fs Resolution: 0.1% fs Thermal characteristic (max.): ± 0.2% fs / 10K Long term stability acc. EN 60770-1 (max.): ± 0.25% fs
Operating Conditions
Medium	Liquids, gases and refrigerants (incl. ammonia)
Temperature	Medium: -40 ... +135 °C Ambient: -30 ... +85 °C Storage: -50 ... +100 °C
Tolerable overload	< 6 bar: 5 x fs > 6 bar: 3 x fs (max. 1500 bar)
Rupture pressure	< 6 bar: 10 x fs > 6 bar: 6 x fs (max. 2500 bar)
Materials
Cover	Stainless steel 1.4404 / AISI 316L (inside thread Schrader 1.4305 / AISI 303 only)
Materials in contact with medium	Pressure connection: Stainless steel 1.4404 / AISI 316L Sensor ≤ 60 bar: Stainless steel 1.4016 / AISI 430 Sensor ≥ 100 bar: Stainless steel 1.4435 / AISI 316L
Plug accommodation	Polyarylamide 50% GF UL 94 V-0
Electrical Data
Output	2 wire: 4 ... 20 mA 3 wire: 0 ... 5 V; 1 ... 6 V; 0 ... 10 V; ratiom. 10 ... 90%
Power supply	7 ... 33 VDC (depending on output version)
Load / Current consumption	Load according to output specification Current consumption: < 23 mA (4 ... 20 mA versions) < 7 mA (voltage output versions)
Polarity reversal protection	Short circuit proof and protected against polarity reversal. Each connection protected against crossover up to max. supply voltage.
Insulation voltage	Standard 500 VDC
Response time	< 2 ms (1 ms typ.) Load cycle: < 100 Hz
Electrical connection	Swift connector (with or without cable 1.5 / 2.0 / 3.0 / 5.0 m, PVC spec.) Connector DIN EN 175301-803-A or C Metri Pack Serie 150 Connector M12x1 Braids Connector RAST 2.5 (3 wire only)
Installation
Installation arrangement	Unrestricted
Approvals
EMC	CE conformity acc. EN 61326-2-3 Enhanced EMC protection EN 50121-3-2
Shock	IEC 68-2-27 100 g, 11 ms half sine wave, all 6 directions
Vibration	IEC 68-2-6 20 g, 15 ... 2000 Hz
UL	ANSI/UL 61010-1 acc. E325110
Railway approval	EN 50155 / EN 45545-2
Explosion protection	ATEX / IECEx Ex II 1/2 G Ex ia IIC T4 Ga/Gb Ex II 1/2 D Ex ia IIIC T125°C Da/Db
Weight	~ 90 g

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Note : Design and specifications are subject to change without notice.

Note : Please make sure the product and the device which connect with RS-485 are on common ground, avoid damaged product.