Prepaid Smart Gas Meter STK25MI Series

STK25MI

The STK25MI is a diaphragm-type prepaid gas meter developed based on the STK25MT smart gas meter, which has over 30 years of sales history in Japan. The STK25MI features a built-in NFC card reader/writer, allowing easy implementation of a prepaid gas system in combination with POS terminals. The STK25MI-NB adds NB-IoT communication while retaining NFC capability.
Both the STK25MI and STK25MI-NB are equipped with multiple safety functions.

Specifications and drawings (STK25MI)

Specifications and drawings (STK25MI-NB)

OIML R137-1(2012)Certification

Model		STK25MI	STK25MI-NB
Maximum flow rate (m³/h)		2.5
Absolute maximum pressure（kPa）		30
Maximum index (m³)		9,999.9999
Minimum index（L）		0.02
Cyclic volume（L）		0.7
Maximum pressure drop at maximum flow rate（Pa）		200
Error rate	Accuracy class	1.5
	0.016～0.25 m³/h（%）	＋/－3
	0.25～2.5 m³/h（%）	＋/－1.5
Meter body		Diecast aluminum
Dimensions（mm）	Height	251
	Width	141
	Depth	140
Span between inlet and outlet（mm）		90
Connection pipe		15A / 20A
Sensors	Seismic	Detect JMA seismic intensity 5 or stronger
	Gas pressure	Optional	N/A
	Leak	By flow measurement
Operating temperature（˚C）		－10 ～ 60
Storage temperature（˚C）		－20 ～ 70
Ambient temperature（˚C）		－10 ～ 60
Gas temperature（˚C）		－10 ～ 60
Gas flow direction		Left to right
Data logging		60×24＋366 points	93×24＋366 points
Communication module		NFC card reader/ writer	NFC card reader/writer, NB-IoT
LCD		7 digits and 12 indicators	7 digits and 9 indicators
Ingres Protection		IP66 (JIS C 0920)
Battery		Lithium Metal Battery
Estimated battery life		Longer than 10 years (depend on the conditions)

System configuration diagram

Prepaid gas meter system introduction example (Bangladesh)

Meter installation site

Card charge center

Charge to meter

Running project is click here.

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