KELLER 23SY Pressure Transmitter 0.1-1000 bar

Name: KELLER 23SY Pressure Transmitter 0.1-1000 bar | Seven Star LLC
Brand: KELLER
SKU: 23SY

KELLER Series 23SY is a fully welded piezoresistive pressure transmitter for machinery, plant and mobile applications, covering 0…0.1 to 0…1000 bar. The stainless steel body is 21 mm in diameter by about 70 mm long and weighs about 120 g; the same datasheet also covers the intrinsically safe 23SY-Ei and the increased-safety 23SY-En versions.

One platform from 100 mbar to 1000 bar

The 23SY uses an insulated and encapsulated piezoresistive sensor chip with no internal seals and a direct analog signal path at 1 kHz bandwidth. KELLER lists industrial applications, machinery and plant manufacturing, agriculture, mobile hydraulics and the railway industry as typical uses.

Accuracy depends on the range: at most 0.25 %FS above 0.3 bar, 0.5 %FS between 0.15 and 0.3 bar and 1.0 %FS between 0.1 and 0.15 bar. The total error band is 0.7 %FS for ranges of 2 bar and above over -10…80 degC, with the datasheet noting that it scales by a factor of 2 for ranges between 0.3 and 2 bar.

Key features as printed in the datasheet

Compensated over -10…80 degC; long-term stability 0.2 %FS per year above 2 bar.
Fully welded, no internal seals; AISI 316L wetted parts.
Optional 23SY-Ei (Zone 0/1/2 and 20/21/22) and 23SY-En (Zone 2).
Outputs 4…20 mA, 0…10 V, 0…5 V and 0.5…4.5 V; start-up below 5 ms.
Cable, M12, M16 round plug and Form A valve plug connections.

Technical specification

Performance and electrical data

Parameter	Specification
Pressure ranges	0…0.1 to 0…1000 bar (PR, PAA, PA)
Accuracy	max. 0.25 %FS (above 0.3 bar), 0.5 %FS (0.15…0.3 bar), 1.0 %FS (0.1…0.15 bar)
Total error band, -10…80 degC	max. 0.7 %FS for 2…1000 bar
Long-term stability	max. 0.2 %FS per year (above 2 bar); 4 mbar (2 bar and below)
Position dependency	max. 1.5 mbar
Outputs	4…20 mA; 0…10 V; 0…5 V; 0.5…4.5 V
Supply 23SY	8…32 VDC (mA, 0…5 V, 0.5…4.5 V); 13…32 VDC (0…10 V)
Supply 23SY-Ei	10…30 VDC; 15…30 VDC for 0…10 V
Load 23SY	below (U – 8 V)/25 mA; above 5 kOhm (3-wire)
Limiting frequency	1 kHz
Start-up time	below 5 ms (0…99 %)
Insulation	above 10 MOhm at 300 VDC

Mechanical, environmental and approvals

Parameter	Specification
Wetted materials	AISI 316L; no internal seal; external seal FKM 75 Shore
Oil filling	Silicone oil
Connections	G1/4 male, G1/4 female, 1/4-18NPT male, G1/2 male
Dimensions / weight	dia 21 mm x approx. 70 mm; approx. 120 g
Medium temperature	-20…125 degC, optional -40…125 degC
Ambient temperature 23SY / 23SY-En	-20…85 degC (optional -40…85 degC) / -20…70 degC
Ingress protection	IP67 M12 (IP54 relative), IP40/IP67 M16, IP65 Form A, IP68 cable
Vibration / shock	10 g, 10…2000 Hz / 50 g, 6 ms
Pressure cycles	more than 10 million; above 450 bar on request
Approvals as printed	CE EMC 2014/30/EU, RoHS 2011/65/EU; 23SY-Ei Ex II 1G Ex ia IIC T6 Ga and Ex II 1D Ex ia IIIC T130 degC Da; 23SY-En Ex II 3G Ex ec IIC T4 Gc

Selection and ordering guide

Three type suffixes matter: plain 23SY for non-hazardous areas, 23SY-Ei for intrinsically safe circuits and 23SY-En for Zone 2. Only the M12 x 1 round plug, the Form A valve plug and the cable variants are approved for 23SY-En, and the voltage outputs 0…5 V and 0.5…4.5 V are not available for it.

Pressure ranges of 0.15 bar and below carry a higher signal limit (up to 31.5 mA) and do not support 0.5…4.5 V. The delivery includes a calibration certificate and the mating plug for the valve connector.

Installation and operation notes

The KELLER operating instructions for pressure transmitters state that the device must be installed unpressurised and de-energised by trained staff, that the pressure connection should be hand-started and then torqued on the spanner flats, and that a non-intrinsically-safe device must not be used in hazardous areas. For the Ei and En versions the conditions of safe use in the instructions apply.

Calibration is done vertically with the connection down, so mounting another way can shift the zero by up to 1.5 mbar (4 mbar below 2 bar).

Applications in Oman and the GCC

Hydraulic power packs, pumps, compressors and rail or mobile equipment suit the 23SY, while the Ei version fits intrinsically safe loops with certified barriers in oil and gas or chemical areas. Check the area classification and the temperature class printed in the datasheet against your site documents.

Compatible accessories and related items

KELLER lists Series 25SY (front-flush) and 21Y as similar products, and 23SY-Ei-H2, 23SY-En-H2 and UHP variants exist on its site. The 21Y and 25Y are also listed on this site.

Frequently asked questions

What range does the 23SY cover?

0…0.1 to 0…1000 bar in relative, absolute and sealed-gauge versions.

Which hazardous-area versions exist?

23SY-Ei for Zone 0/1/2 gas and 20/21/22 dust, and 23SY-En for Zone 2, with the markings given in the datasheet.

What outputs are available?

4…20 mA, 0…10 V, 0…5 V and 0.5…4.5 V; 23SY-En offers only the first two.

What is the total error band?

Up to 0.7 %FS over -10…80 degC for ranges of 2 bar and above.

Is Seven Star LLC a KELLER distributor?

No. Seven Star LLC is not a KELLER distributor; it is an independent Muscat-based supplier that quotes KELLER products on request.

Documents and quotation

Need 23SY? The KELLER datasheet is attached to this listing. Seven Star LLC (independent supplier, Muscat) can quote the item and arrange supply on request; list quantity and site location in your enquiry. Verify the code, dimensions and approvals in the document before ordering. Other products are in the category page.

Pressure transmitters and level probes

The KELLER range covers standard and front-flush pressure transmitters, differential and low-pressure transmitters, submersible level probes, digital pressure gauges and data loggers. Many X-line devices combine RS485 Modbus RTU with an analog output, and intrinsically safe or increased-safety versions are offered for hazardous areas.

Frequently Asked Questions