The devices of the ES-2x series are electronic safety switching devices for pressure monitoring with comprehensive self-diagnostic functions and fail-safe design. The devices are used as pressure regulators, for minimum or maximum pressure limitation on compressors in refrigeration and air conditioning systems, on heat pumps, steam boiler systems and on hydraulic systems.

H2 ready - ES-2x suitable for hydrogen

The ES-2x series electronic safety switching devices are particularly suitable for hydrogen applications. All parts in contact with the media, the pressure diaphragm, and the pressure connection are precision-machined from stainless steel 1.4404 and manufactured in one piece without oil filling or welds. Potential weak points for H2 molecules, such as inclusions and leaks, are eliminated from the outset.

With the exception of the integrated switching relays, there are no mechanically moving components, ensuring high vibration resistance and a long service life.

The switching limits can be conveniently set and precisely monitored. Comprehensive self-diagnostic and logging functions ensure reliable monitoring and rapid shutdown of the hazard source, as well as high traceability of any events that occur.

All devices delivered as pressure monitors, pressure limiters, or safety pressure limiters (also combined) are EU type-examined safety switching devices for pressure limitation.

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Safety function	Description
	pressure regulator The device's response to pressure changes can be freely defined by entering parameters, e.g. two-point controller, PID controller, etc. Additional functions can be added upon customer request.
	Pressure switch (PSH/DWK) Setting a switching point and a reset point (hysteresis) The device is automatically reset or unlocked.
	Pressure limiter (PZH/DBK) Setting a switching point Resetting and unlocking is done manually on the device (without tools).
	Safety pressure limiter (PZHH/SDBK) pressure cut out Setting a switching point Resetting and unlocking is done manually using a tool directly on the device.

System design

The ES-2... devices are constructed from a compact, anodized aluminum housing and, depending on the device variant, are designed as pressure regulators, pressure limiters, pressure monitors, or safety pressure limiters of a special design. Combinations, such as series-connected pressure limiters and safety pressure limiters according to EN 378, are also implemented in a single housing.

The devices are generally delivered with preset limits and parameters. Setting a password essentially "seals" the device. Once enabled (password entry), authorized personnel can change the device settings and perform manual tests on the device or via the app.

Monolithic stainless steel pressure measuring cells are used for monitoring relative pressures. Since there are no sealing rings or welds, the devices of the ES-2... series offer a high level of robustness and media compatibility, even with aggressive media. Regardless of the relative or differential pressure measurement, the faultless function of the pressure measurement is checked and documented by the device itself during operation.

The devices have two independent switching outputs, which in the ES-21 and ES-22 versions are combined to form a self-monitoring switching output. The installed relays are continuously monitored by an additional circuit, reliably preventing opening failure. In addition, the switching function is independently checked by the device both when the power supply is applied to the device and at regular intervals during operation. In the event of a fault, the device always switches to the safe state.

Extension of measuring channels

Depending on the application, it may be necessary to use multiple pressure monitors for multiple pressure circuits. In this case, an ES device can be equipped with a channel extension. For this purpose, specially developed SIL 2-capable pressure transmitters (ZT-S…) are connected to the ES device via a secure communication interface. The ES device is capable of monitoring multiple pressure circuits and issues a collective alarm when one of the set limit values ​​is reached. Setting, logging, and testing work the same as with a single-channel device.

Switching channel expansion

In addition to additional measuring channels, an expansion unit (ESE) adds additional switching contacts. This enables the creation of a distributed safety chain, e.g., with multiple pressure transmitters and switching outputs.

Variants and features

Merkmal	ES-20	ES-21	ES-22
Certificates
SIL-2	✔	✔	✔
DGRL 2014/68/EU	✘	✔	✔
Safety functions
amount	wählbar	1	2
pressure regulator	✔	✘	✘
pressure switch	✔	✔	✔
pressure limiter	✔	✔	✔
pressure cut out	✔	✘	✔
measurement principle
Relative and/or Absolute pressure	✔	✔	✔
differential pressure	✔	✘	✘
Comfort functions
App-Communication	✔	✔	✔
4..20 mA signal output	✔	✔	✔
measuring channel extension	✔	✘	✔
switching channel extension	✔	✘	✔
Alarm output	✔	✔	✔
remote unlocking	✔	✔	✔

 

Merkmal	ES-20	ES-21	ES-22
Zertifizierungen
SIL-2	✔	✔	✔
DGRL 2014/68/EU	✘	✔	✔
Sicherheitsfunktionen
Anzahl	wählbar	1	2
Druckregler	✔	✘	✘
Druckwächter	✔	✔	✔
Druckbegrenzer	✔	✔	✔
Sicherheitsdruckbegrenzer	✔	✘	✔
Messprinzip
Relativ- bzw. Absolutdruck	✔	✔	✔
Differenzdruck	✔	✘	✘
Komfortfunktionen
App-Kommunikation	✔	✔	✔
4..20mA Signalausgang	✔	✔	✔
Messkanalerweiterung	✔	✘	✔
Schaltkanalerweiterung	✔	✘	✔
Alarmausgang	✔	✔	✔
Fernentriegelung	✔	✔	✔

Properties

Operating voltage

16...32 V DC (max. 5,9 W)

Dimensions

150 x 60 x 42 mm (L x B x H)

Housing

Aluminium (eloxiert)

Protection class

IP65

Approvals

DGRL 2014/68/EU Kat:IV

Baumustergeprüft gemäß Druckgeräterichtlinie

DIN EN12263:1998

Kälteanlagen und Wärmepumpen Sicherheitsschalteinrichtungen zur Druckbegrenzung -Anforderungen und Prüfungen; Kategorie IV

DIN EN378:2020

Kälteanlagen und Wärmepumpen - Sicherheitstechnische und umweltrelevante Anforderungen

DIN EN61508:2011

SIL2

Measuring ranges

Measuring range relative pressure (nominal pressure)

-1…500 bar

Measuring range differential pressure (nominal pressure)

0…1 mbar - 0…1.000 mbar

Setting accuracy (from nominal pressure)

0,1 %

Operating conditions

Pressure type

Relativdruck, Differenzdruck

Temperature of the fluid

-40…+125 °C

Ambient temperature

-20…+65 °C

Parts in contact with media

Edelstahl

process connection

Version relative pressure

G ¼“ Innengewinde

Version differential pressure

G ⅛“ Innengewinde

Adapter for process connection

6mm; 8mm oder 10mm

electrical connection

Analogue current output

1x 4…20 mA

Digital inputs/outputs

2x Alarm oder 1x Alarm & 1x Fernentriegelung

Load capacity of the switching contacts DC (24V)

DC1

16 A

DC13

1,5A

Load capacity of the switching contacts AC (230V)

AC1

16 A

AC3

10 A

AC15

7 A

Depending on the application, it may be necessary to use multiple pressure monitors for multiple pressure circuits. In this case, an ES device can be equipped with a channel extension. For this purpose, specially developed SIL 2-capable pressure transmitters (ZT-S…) are connected to the ES device via a secure communication interface. The ES device is capable of monitoring multiple pressure circuits and issues a collective alarm when one of the set limit values ​​is reached. Configuration, logging, and testing work the same as with a single-channel device.

In addition to additional measuring channels, an expansion unit (ESE) adds additional switching contacts. This enables the creation of a distributed safety chain, e.g., with multiple pressure transmitters and switching outputs.

ES-2

Measurend

D : Pressure

DD : Differential pressure

Safetyfunction

A : DWK (pressure switch)

B : DBK (pressure limiter)

Direction

(H) : Rising/Maximum

(L) : Falling/Minimal

measuring-range

10 : bar

60 : bar

150 : bar

0 : Other (please specify)