SF₆ gas solutions
Calibration system for gas density instrumentation
Model ACS-10
WIKA data sheet SP 60.15
Applications
■ Fully automatic testing of SF6 density measuring
instruments through comparative measurements
■ Simple measurement on-site, in the laboratory or in the
workshop
Special features
■ Fully automatic testing of leakage detection systems
■ Pressure generation via an integrated compressor
■ Highly accurate pressure reference sensors with an
accuracy of 0.06 %
■ Variable connection concept of the test items
■ Suitable for a wide range of leakage detection systems
Calibration system, model ACS-10
Description
Simple operation Fast field recalibration
The calibration system model ACS-10 is used for the fully All necessary components required for a fully automatic
automated testing of the SF6 gas density and pressure recalibration are integrated in this calibration case.
measuring instruments through comparative measurements. The large touch display enables easy configuration of the
This calibration system is used to check quickly and easily test parameters, explains the test process step by step and
both density-based and pressure-based mechanical enables clear management and viewing of historical test
measuring instruments. results.
Functional check in accordance with the F-gas regulation
With regard to switchgear safety, asset protection and
environmental protection, it is common to perform functional
checks of the leakage detection systems on a regular basis.
Article 5 of the EU regulation on fluorinated greenhouse
gases provides for checking of the leakage detection
system at least every 6 years if it contains more than 22 kg
[48.5 lbs] SF₆ gas and the electrical asset was installed after
01 January 2017.
WIKA data sheet SP 60.15 ∙ 01/2024 Page 1 of 7
User interface
Operation
The user interface is intuitive and can be operated via a
capacitive touchscreen.
Recalibration of leakage detection systems
A wide range of leakage detection systems with and without
switch contacts can be recalibrated.
Detailed description of the measured values
The measuring results for rising and falling switching
accuracy, hysteresis and contact resistance are displayed in
detail after the measurement.
The evaluation of the results is based on the user
specifications. For reference chamber instruments (e.g.
model GDM-RC-100), the accuracy values can be
given in absolute values. For bourdon tube based (e.g.
model GDM-100), relative accuracies in % with respect to full
scale can be selected.
Depending on the equipment, the results can be exported via
the USB interface or printed directly on-site with a printer.
WIKA data sheet SP 60.15 ∙ 01/2024 Page 2 of 7
Functional principle
The model ACS-10 calibration system can recalibrate bourdon tube based (e.g. model GDM-100) or bellows-based gas
density monitors (e.g. model GDM-RC-100), as well as gas density switches (e.g. model GDS-RC-HV).
Gas density indicators (e.g. model GDI-100) can perform a functional test, including a visual inspection.
The test item is connected to the calibration system by means of a metal flex hose and a connection kit, which are included in
delivery.
After entering the respective switch points and the class or absolute accuracy of the leakage detection system, the test item is
pressurised and subjected to a fully automated recalibration.
The calibration system is suitable for the following gases:
■ SF6 (calculation selectable in accordance with Döring, Bier or Beattie-Bridgeman)
■ N2
■ Air
■ 3M™ Novec™ 4710
■ CO2
■ O2
■ He
The model ACS-10 calibration system consists of a main case and an accessory case. The accessory is not included in the
standard scope of delivery.
Test procedure
1. The pressure in the test item is reduced to the ambient pressure.
2. The pressure is built up, quickly and continuously, up to the end of the measuring range.
3. When the pressure is reduced to ambient pressure again, the contact resistances are measured and the approximate
switch contact positions are determined.
4. Through a gradual pressure build-up and subsequent pressure reduction, the switch points are tested with an average
pressure change rate of 20 mbar/s [0.29 psi/s] in the previously determined areas where switching events occur. During
this process, DC 24 V is applied to the switch contacts. The exact pressure values at which switching events occur and
also the hysteresis are determined.
5. Following the test, the original pressure, prevailing before the start of the measurement, is restored in the test item.
Requirements for the test items
■ Gas density monitors with relative and absolute accuracy specification can be recalibrated
■ Optimum test volume in which the specification of the ACS-10 applies: 50 ... 300 ml (in addition to the hose volume)
■ Testing of up to 5 switch contacts in the range -1 ... 9 bar rel. [-14.50 ... 130.53 psi rel.] gauge as normally closed or normally
open contacts.
WIKA data sheet SP 60.15 ∙ 01/2024 Page 3 of 7
Overview
11
12
13
CON1: Pressure connection for test item
Connection for the Pt100 thermometer
Connection for the connection kit
Grounding connection
CON2: Connection for filling and emptying the instrument
DN8 and DN20 couplings
Connection for the power supply
Storage compartment for the connection kit
USB interface for the export of files
Product label
11 Storage compartment for the hose pack and the connection cables for gas density monitors
12 RS-232 interface for the printer
13 On and Off switch
WIKA data sheet SP 60.15 ∙ 01/2024 Page 4 of 7
Specifications
Accuracy specifications
Accuracy
Accuracy of pressure reference sensors 0.06 % of full scale value (±9.6 mbar [0.13 psi])
Accuracy of the temperature measurement ±1 °C [±33,8 °F]
Accuracy of the switch contact resistance measurement ≤ ±2 % of full scale value (0.2 Ω)
Accuracy of restoring the original output pressure in ±1 % of the accuracy of the output pressure
the test item after measurement
Compensated range 5 ... 40 °C [41 ... 104 °F]
Long-term stability of pressure reference sensors ≤ ±0.1 % of span/year
Measuring range
Measuring range of reference sensors 0 ... 16 bar abs. [0 ... 232.06 psi abs.]
Pressure type Absolute pressure
Measuring range of the contact resistance 0 … 10 Ω
Position of the switch points to be calibrated ■ -1 … +9 bar gauge at 20 °C [-14.50 ... +130.53 bar rel. at 68 °F]
■ 0 ... 70 g/l SF₆ gas
Output signal
Communication
Interface USB
Export ■ List of test item data
■ Measuring point data
■ Measurement reports
Internal data storage ■ Min. 250 measuring points
■ Min. 500 measurement records
Voltage supply
Voltage supply AC 85 … 264 V, 47 … 63 Hz
Max. power consumption 120 W
Max. current supply 5A
Switch contact testing
Voltage for determining the switching status DC 24 V
(applied to the switch contact pairs)
Current for determining the contact resistance (on 90 … 110 mA
the closed switch contacts)
Components
Plastic case
Transport Telescopic handle and two castors
Dimensions of the main case 58 x 47 x 30 cm [22.8 x 18.5 x 11.8 in]
Weight of the main case Approx. 29.4 kg [64.8 lbs] (with contents)
WIKA data sheet SP 60.15 ∙ 01/2024 Page 5 of 7
Components
Internal gas tank
Maximum residual pressure after the instrument has < 20 mbar abs. [< 0.29 psi abs.]
been pumped out
Maximum residual pressure after evacuation of the ■ < 500 mbar abs. [< 7.25 psi abs.] (in external gas cylinder with 5 bar abs.
instrument [72.51 psi abs.])
■ < 200 mbar abs. [< 2.90 psi abs.] (in external empty gas bag)
Max. permissible filling pressure in the internal tank 9 bar abs. [130.53 psi abs.]
Touch display
Size 25,7 cm [10.1 in]
Format 16:9
Hose (pneumatic connection)
Length 4 m [157.48 in]
Diameter 2,5 mm [0.09 in]
Internal compressor Average rate of pressure change when testing switch 20 mbar/s
points with a test item volume of min. 50 ml (with hose) [0.29 psi/s]
Maximum overshoot when approaching a target pressure 1 % of target pressure
Maximum connection pressure CON1 (test item) 16 bar abs. [232.06 psi abs.]
Maximum connection pressure CON2 (filling and 10 bar abs. [145.03 psi abs.]
emptying)
Operating conditions
Medium temperature 5 ... 40 °C [41 ... 104 °F]
Ambient temperature 5 ... 40 °C [41 ... 104 °F]
Storage temperature -10 ... +60 °C [14 ... 140 °F]
Relative humidity 10 … 90 %
Ambient pressure 600 … 1,060 hPa
Vibration resistance EN 30786-2, annex A.2.7
Shock resistance EN 60068-2-31, chapter 5.1.3.3 (overturning) and chapter 5.2 (free fall)
Ingress protection
Closed case, transport IP65
Open case, operation IP40
Transport The instrument may only be transported in transport mode (pressure in the instrument < 2 bar abs.
[29.00 psi abs.]).
Maintenance Recommended calibration of the reference sensor in a WIKA service hub after two years or
7,000 measurements
Approvals
Logo Description Country
EU declaration of conformity European Union
EMC directive
EN 61326 emission (test basis: EN 55011, group 1, class B) and immunity
(test basis: EN 61000-4-3, industrial application, evaluation criteria B/C)
Machinery directive
RoHS directive
→ Approvals and certificates, see website
WIKA data sheet SP 60.15 ∙ 01/2024 Page 6 of 7
Accessory case
Equipped with all components from the accessories
Accessories 1)
Description Order number
Printer incl. spare castors 14329621 and 14436616
Malmquist adapter (M30 x 2, male) for quick coupling 14037946
Adapter G 3/4 female to quick coupling 14037987
Adapter M26 x 1.5 for model GDM-100 with recalibration valve and model GLTC-CV to quick coupling 14146937
Adapter G 1/4 female to quick coupling 14321474
Adapter G 1/2 female to quick coupling 14037984
Pressure reducer for the connection for filling and emptying 13497678
(Gas cylinder connection W 21.8 x 1/14", max. initial pressure 200 bar [2900.75 psi], output pressure to
10 bar [145.03 psi])
Altimeter 14436753
Hand scanner 14382587
1) Accessory is not included in the standard scope of delivery
Scope of delivery
Main case
■ Operating instructions
■ Connection kit
■ Adapter DN8 female to quick coupling
■ Adapter DN20 female to quick coupling
■ Hose pack 4 m [157.48 in]
■ 16-core connection cable for gas density monitor and switch, for up to 5 change-over contacts
■ Power supply unit with connector adapters for USA, China and the UK
Ordering information
Model / Measuring range of the reference pressure sensors / Length of the connection hose to the test item / Accessory case
/ Hand scanner / Printer / Altimeter / Pressure reducer / Adapter G 1/2 female to quick coupling / Adapter M26 x 1.5 to quick
coupling / Adapter M30 x 2 male to quick coupling / Adapter G 3/4 female to quick coupling / Adapter G 1/4 female to
quick coupling / Certificate / External rechargeable battery / Additional ordering information
© 10/2021 WIKA Alexander Wiegand SE & Co. KG, all rights reserved.
The specifications given in this document represent the state of engineering at the time of publishing.
We reserve the right to make modifications to the specifications and materials.
In case of a different interpretation of the translated and the English data sheet, the English wording shall prevail.
WIKA data sheet SP 60.15 ∙ 01/2024 Page 7 of 7
01/2024 EN
WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Tel. +49 9372 132-0
info@wika.de
www.wika.de
