Keller Castello Specifications

Content MeasureMent systeM

86 mm

53 mm

Ø 21 mm

60 mm

7 mm

12mm

6kt – SW 17

USIT-Ring

G1/4’’

Ø 21 mm

10500

KELLER

98 mm

64 mm

Air-Pressure On-Button

Ø 9,2 mm / Ø 8,6 mm

for ventilated or pressurised tanks

Castello offers a user-friendly way to re present the pressure measurement at the bottom of a
tank as the quantity of remaining liquid. At the push of a button, the micro -controller performs
the calculations using the information of the tank shape and dimen sions and displays the re­maining tank content quantity on the clearly legible 5-digit LED display in the desired unit (litres,
gallons etc.).

The unit is congured using a PC and the easy-to-use software so that the lling level, which
determines the pressure, can be converted into an appropriate lling quantity. First the tank
shape is selected, then the tank dimensions and the specic gravity of the liquid are entered. It

contains the most current tank shapes. The program covers the most common tank shapes, but

also enables any shape by entering the parameters into a specied table.

The exclusive use of absolute pressure sensors in the Castello system eliminates the use of
capillary vented cables with all the problems associated with a gauge pressure measurement.
The Castello housing integrates an air pressure sensor, ranged between 0,8 bar and 1,2 bar
absolute. The sensors to measure the hydrostatic pressure at the bottom of the tank are cali­brated from 0,8 to 1,8 bar abs for tanks up to 5 m in height, and 0,8 to 2,3 bar abs for tanks up to
10 m in height. The pressure difference, calculated by the
static pressure.

The content of a pressurised tank is determined using the difference between the measure­ments from two absolute pressure sensors located at the top and bottom of the tank.

The overall accuracy of the system of 2 mbar is achieved using a computerised calibration

and compensation procedure for the pressure sensors. The coefcients for this calculation are
stored in EEPROMs in the sensors. These are retrieved by the micro processor at each mea-

surement and employed within the equations to calculate the pressure values. The Castello
housing and hydrostatic sensor can be interchanged at will.

It is also possible to connect a standard 3-wire transmitter or high-precision digital transmitter

(Series 36 X) that can be congured to an accuracy of 0,02 %FS over a range of 0 to 50 °C, a

true representation of which is displayed by the Castello.

The power supply to the system (8 to 28 V) can be provided externally or internally using a
9 V battery. The display is obtained by pressing the button on the front, and the value appears

for a congurable duration. The Castello has two switch outputs with congurable functiona lity

and threshold values. An external power supply must be provided if the switch outputs are used.

micro -controller

, is the relative hydro-

Castello

CA1

Series 23 Q

Series 26 Q

Indication of
switching outputs (LED)

Bottom View

Drill holes for mounting

KELLER AG für Druckmesstechnik
CH-8404 Winterthur

[phone]
[e-mail]

Binder male socket
8 pole / Serie 723

Pin connection

1: +S1 (Relayoutput)
2: -S1 (Relayoutput)
3: +S2 (Relayoutput)

4: + VCC (8…28 VDC)

5: RS 485 A
6: -S2 (Relayoutput)
7: RS 485 B

8: GND

34 mm

Side View

Optional:
second transmitter

Diaphragm’s position

20 mm

36 mm

KELLER Ges. für Druckmesstechnik mbH

DE-79798 Jestetten

[phone]
[e-mail]

Mounting Options

Ø 4,8 mm

8

KELLER America

Newport News, Virginia

1 877 253 5537
[e-mail]

Series 26 Q

10500

KELLER

/ / / / / / / / / / / / / / / / / / / / / / /

Series 23 Q

Edition 04/2018

Subject to alterations
Companies approved to ISO 9001

www.keller-druck.com

Installation

There are two holes in the housing for mounting the unit. To install the sensor, unscrew and remove the cover of the unit, lead the cables through

the PG screw connections and attach the wires to the screw terminals. The Castello is programmed via the connector on the side, which is also
the location of the external power supply and switch output connections. Provided that the cover and the cable leadthrough are securely tightened,
the extremely robust housing is watertight in compliance with IP65.

Castello Ordering Information

Castello basic unit + KELLER standard transmitter series 23 Q (with thread) or series 26 Q (for lling level)
+ converter K-107 (serial) or K-104B (USB) for conguration incl. adapter (5-pin --> 8-pin)
or conguration in accordance with customer specications

Specications for Castello

Measuring / Pressure Ranges 5 m tank level (10 m standard cable): Range 0,8…1,8 bar abs.
10 m tank level (15 m standard cable): Range 0,8…2,3 bar abs.

Supply External: 8…28 V
Internal: 9 V battery

Switch outputs 2 pcs. PhotoMOS-Relais 40 V / 0,4 A

Battery Life

4’000 Measurements (display 10 seconds on)
6’000 Measurements (display 5 seconds on)
Interface RS485

Air Pressure Probe Level Probe
Temperature Range -20…+70 °C 0…50 °C

Accuracy (Error Band) max. 0,5 mbar

2 mbar (1,8 bar range)
3 mbar (2,3 bar range)

Indicator 5 digits – 14 mm high
7 segments LED

Resolution Min. 2’000 Points
Indicator Material Aluminium
Level Probe Material Stainless Steel AISI 316L

Cable Type Hytrel, 4,60 mm Ø

Probe Protection IP 68
Indicator Protection IP 65

Probe Certication II 1 G EEx ia IIC T6

LCIE 02 ATEX 6124 X

Indicator Certication In Progress

Overpressure 2 x Nominal Range

Conguration PC-Software

The software to congure Castello can be downloaded from our website or
ordered on CD for a handling charge. Castello can be connected to the PC
via KELLER converter cable K-107 or K-104B with adapter. Castello can be
congured for standard or EEPROM transmitters.

The software contains the pressure/content curves of the featured tanks.

The dimensions of the tank of a certain shape and the specic gravity of the

liquid is entered and the measurement unit for the display chosen.

The software also foresees the application for free standing water towers,
where the distance of the tank to the position of the transducer can be
chosen.

Options (extra charge):

–

Face plate with various measuring units and
customer’s logo

– Other housing colours (default: grey)

– Carrying case

– Factory conguration: foil strip on rear con-

taining all application-related details

– Wireless transmission via ARC-1

KELLER AG für Druckmesstechnik
CH-8404 Winterthur

[phone]
[e-mail]

KELLER Ges. für Druckmesstechnik mbH

DE-79798 Jestetten

[phone]
[e-mail]

KELLER America

Newport News, Virginia

1 877 253 5537
[e-mail]

Edition 04/2018

Subject to alterations
Companies approved to ISO 9001

www.keller-druck.com