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Abox series with accessories

DLG-APPROVED: "Resistance to ammonia"

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The Approval

A test mark ‘DLG-APPROVED for individual criteria’ is awarded for agricultural products which have successfully fulfilled a scope-reduced usability testing conducted by DLG according to independent and recognised evaluation criteria. The test is intended to highlight particular innovations and key criteria of the test object. The test may contain criteria from the DLG test scope for overall tests, or focus on other value-determining characteristics and properties of the test subject. The minimum requirements, test conditions and procedures as well as the evaluation bases of the test results will be specified in consultation with an expert group of DLG.

They correspond to the recognised rules of technology, as well as scientific and agricultural knowledge and requirements. The successful testing is concluded with the publication of a test report, as well as the awarding of the test mark which is valid for five years from the date of awarding.
The ‘Resistance to ammonia’ test was conducted as a laboratory test according to the patented DLG test standard. The objective of this test is to determine whether barn installations can withstand the effects of stable air. Factory-new samples of all installed materials were tested. The test was based on the DLG test specification for investigating resistance to ammonia, version 07/2023. Other criteria were not tested.

Assessment in brief

The as-new test samples were tested regarding their ammonia resistance according to DLG-APPROVED test methods. The tested samples have met the requirements regarding the examined criteria.

Table 1: Summary of test results

Dlg Quality profileTest resultEvaluation* 
Single Criteria Resistance to Ammonia  
Abox series up to size 100resistant
■■■■
Abox series from size 160partially resistant
■■■■
Abox Pro series up to size 100partially resistant

■■■■

Abox Pro series from size 160partially resistant

■■■

Abox accessories – Partition wallresistant

■■■

Abox assessories – Sealing kitresistant

■■■

Abox accessories – Insulating plugsresistant

■■■■

Abox accessories – Terminal holderresistant

■■■■

Abox accessories – Terminal blockresistant

■■■■

Abox accessories – Mounting plateresistant

■■■■

Abox accessories – Double-membrane sealsresistant

■■■■

Abox accessories – Attachment bushesresistant

■■■■

Abox accessories – Cable glandresistant

■■■■

*    The DLG test framework provides the following options in its evaluation schemes:    
■■■  or better = meets, exceeds or clearly exceeds the specified DLG standard
■■,  = meets the legal requirements for marketability,
 = failed

The product

Description and specifications

The samples tested here are components of the junction box from the Abox series. The box is also installed in animal houses, and can thus be exposed to elevated levels of ammonia in the housing environment.

Table 2: Technical characteristics (according to manufacturer)

Junction box Abox seriesAbox seriesAbox Pro series
Rated voltage1000 V AC
1000 V DC
1000 V AC
1000 V DC
Length87 – 252 mm92 – 252 mm
Width87 – 252 mm92 – 252 mm
Height52 – 120 mm60 – 120 mm
Accessories Dimensions
TWPartition wall23 mm x 72 mm x 43,5 mm
PSTSealing Kit15 mm x 15 mm x 15 mm
Abox 100 KH 2006 6²Terminal holder TOPJOB69 mm x 124 mm x 60 mm
Abox 160 KH 2010 10²Terminal holder TOPJOB79 mm x 154 mm x 65 mm
Abox 250 KH 2016 16²Terminal holder TOPJOB77 mm x 219 mm x 77 mm
Abox 025/040 KH 2273 2,5²Terminal holder Wago23 mm x 70 mm x 27 mm
Abox 025/040 KH 221 4²Terminal holder Wago23 mm x 56 mm x 29 mm
Abox 100 KH 221 4²Terminal holder Wago22 mm x 88 mm x 32 mm
Abox 100 KH 221 6²Terminal holder Wago26 mm x 114 mm x 32 mm
KLS-2,5²/4²Terminal block46,6 mm x 17,8 mm x 31,5 mm
MPIMounting plate94 mm x 94 mm x 2,5 mm up to 217 mm x 217 mm x 2,5 mm
DMSDouble-membrane seals 
ASTAttachement bushes 
KVRCable gland 
 Insulating plugs Abox Pro 
 Insulating plugs Abox 

The enclosures of the Abox series up to size 100 are manufactured from polypropylene (PP); those of the Pro series up to size 100 are manufactured from polycarbonate (PC). As of size 160, both enclosure series are manufactured from glass fibre-reinforced PC. 

Table 2: Specifications (manufacturer information)

Junction box Abox series Abox series Abox Pro series
Rated voltage 1000 V AC
1000 V DC
1000 V AC
1000 V DC
Length 87 – 252 mm 92 – 252 mm
Width 87 – 252 mm 92 – 252 mm
Height 52 – 120 mm 60 – 120 mm
     
Accessories   Dimensions
TW Partition wall 23 mm x 72 mm x 43,5 mm
PST Sealing Kit 15 mm x 15 mm x 15 mm
Abox 100 KH 2006 6² Terminal holder TOPJOB 69 mm x 124 mm x 60 mm
Abox 160 KH 2010 10² Terminal holder TOPJOB 79 mm x 154 mm x 65 mm
Abox 250 KH 2016 16² Terminal holder TOPJOB 77 mm x 219 mm x 77 mm
Abox 025/040 KH 2273 2,5² Terminal holder Wago 23 mm x 70 mm x 27 mm
Abox 025/040 KH 221 4² Terminal holder Wago 23 mm x 56 mm x 29 mm
Abox 100 KH 221 4² Terminal holder Wago 22 mm x 88 mm x 32 mm
Abox 100 KH 221 6² Terminal holder Wago 26 mm x 114 mm x 32 mm
KLS-2,5²/4² Terminal block 46,6 mm x 17,8 mm x 31,5 mm
MPI Mounting plate 94 mm x 94 mm x 2,5 mm up to 217 mm x 217 mm x 2,5 mm
DMS Double-membrane seals  
AST Attachement bushes  
KVR Cable gland  
  Insulating plugs Abox Pro  
  Insulating plugs Abox  

The Method

Resistance to ammonia

The ammonia resistance of the materials was determined by a laboratory testing according to the DLG test standard for agricultural use. With the DLG laboratory test for NH3 resistance, it is possible to determine the ability of the test sample to withstand the effects of animal house air over a usage period of about 10 years.

The test was carried out in a gassing chamber under the following climate conditions:

Duration of the test 1500 h
Air temperature 70 °C
Relative humidity 70 %
Ammonia concentration 750 ppm

For assessing the NH3 resistance, the test samples were examined visually, gravimetrically and through a measurement of the material thickness before and after the climate testing. The measurement of shore hardness only yielded relevant and tangible results for the accessory parts. The materials were tested on the basis of at least two samples.

Detailed account of the test results

Ammonia resistance

Neither the empty enclosures of the Abox series up to size 100 nor the tested accessories revealed any anomalies during the test. The enclosures’ different colours did not limit their functionality during the test.

The tested empty enclosures of the Abox Pro series and the Abox series as of size 160 did not initially reveal any visual anomalies either. On installation and removal of the cover, however, moderate embrittlement of the material was ascertained. This embrittlement was largely confirmed by measuring the hardness. As the basic functionality was not limited, these test samples can be classified as partially resistant to ammonia. Despite this, moving the threaded connections of the cover in this series with corresponding care is recommended.

Since the deviations do not affect the functionality of the component and significantly lower ammonia con­centrations often occur in practice, the entire empty enclosure can nevertheless be assessed as essentially suitable. All other deviations in the measured parameters lay within the measurement uncertainty or the assessment limits. It is therefore to be assumed that the materials can essentially withstand an NH3-laden atmosphere such as that encountered in the exhaust air of pig houses.

The results for the enclosures, accessories and colours are shown in Tables 3 to 5.

Table 3: Impact of NH3 on the enclosures

Component   Visual assessment Weight Shore hardness Evaluation
Abox Box (size 025 to 100), grey cover with seal no change < 1.0 % < 3.0 % resistant
Abox Box (size 160 to 350), grey cover with seal Embrittlement < 1.0 % < 3.0 % partially resistant
Abox Pro Box (size 025 to 100), grey cover with seal Embrittlement < 1.0 % < 5.0 % partially resistant
Abox Pro Box (size 160 to 350), grey cover with seal Embrittlement < 1.0 % < 5.0 % partially resistant
Abox series empty enclosures         resistant

Table 4: Impact of NH3 on the accessories

Partition wall Abox no change < 1.0 % not tested resistant
Sealing Kit Abox no change < 6.0 % not tested resistant
Insulating plugs Abox no change < 1.0 % not tested resistant
Insulating plugs Abox Pro no change < 1.0 % not tested resistant
Terminal holder TOPJOB Abox no change < 1.0 % not tested resistant
Terminal holder TOPJOB Abox Pro no change < 1.0 % not tested resistant
Terminal holder ELS Abox no change < 1.0 % not tested resistant
Terminal holder ELS Abox Pro no change < 1.0 % not tested resistant
Terminal holder WAGO 1 Abox no change < 1.0 % not tested resistant
Terminal holder WAGO 1 Abox Pro no change < 1.0 % not tested resistant
Terminal holder WAGO 2 Abox no change < 1.0 % not tested resistant
Terminal holder WAGO 2 Abox Pro no change < 1.0 % not tested resistant
Terminal block Abox no change < 1.0 % not tested resistant
Terminal block Abox Pro no change < 1.0 % not tested resistant
Mounting plate Abox no change < 1.0 % < 1.0 % resistant
Mounting plate Abox Pro no change < 1.0 % < 1.0 % resistant
Double-membrane seals Abox Pro no change < 1.0 % not tested resistant
Attachment bushes Abox no change < 3.0 % not tested resistant
Attachment bushes Abox Pro no change < 3.0 % not tested resistant
Cable gland Abox no change < 3.0 % not tested resistant
Cable gland Abox Pro no change < 3.0 % not tested resistant
Accessories of the Abox series         resistant

Table 5: Impact of NH3 on the sample colors

Colors   Visual assessment Weight Shore hardness Evaluation
Black, white Abox Pro Embrittlement < 1.0 % < 5.0 % partially resistant
Cover red Abox Pro Embrittlement < 1.0 % < 3.0 % partially resistant
Black, white Abox no change < 1.0 % < 3.0 % resistant
Cover red Abox no change < 1.0 % < 3.0 % resistant
Colors of the Abox series         resistant

Summary

The results of the test show that the Abox series with all accessories meets the DLG requirmement for ammonia resistant for receiving the DLG APPROVED quality mark. As a result of this, it can be assumed that the tested series is to be classified as resistant to ammonia-laden barn air. The moderate embrittlement of those empty enclosures that are manufactured from polycarbonate does not limit the basic functionality.

Manufacturer and applicant

Günther Spelsberg GmbH & Co. KG
Im Gewerbepark 1
D-58579 Schalksmühle

Contact
Telephone+49 (0)2355 892-0
Telefax +49 (0)2355 892-299
info@spelsberg.de
www.spelsberg.de

Test implementation

DLG TestService GmbH, Gross-Umstadt location
The tests are conducted on behalf of DLG e.V.

Department
Farm Inputs

Division head
Dr. Michael Eise

DLG test scope
“Resistance of stable components to ammonia” (status 07/2023)

Test engineer
Dipl.-Ing. (FH) Tommy Pfeifer *

*    Author

Contact

DLG TestService GmbH - Groß-Umstadt location • Max-Eyth-Weg 1 64823 Groß-Umstadt Germany • Tel.: +49(0)69 24 788-611 • tech@DLG.org