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HM100PR Density Monitors

HM100PR Density Monitors are used to monitor SF6 gas density in sealed tanks. They are applied to provide alarm signal outputs when the density reaches preset values. Furthermore, it can transmit the real-time SF6 gas density data remotely, to achieve online remote monitoring function.. They are specifically designed for over 500kV EHV grade application field, adapting multilevel protection and full range of shielding measures to ensure the reliable operation of the products.

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Application

Feature

Technical Data

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SF₆ Gas Insulated Switchgear (GIS)
SF₆ Insulated Circuit Breakers
SF₆ Insulated Pole-Mounted Switch
SF₆ Insulated Transformers
SF₆ Insulated Current Transformers or Voltage Transformers
SF₆ Insulated Busbar Systems

They adopt highly reliable protection circuit design, mul- ti-level isolation and filtering technology, thus effectively inhibiting the intrusion of conductive interference.
They adopt the full-body shield design, stainless steel shield- ing shell, shielding junction box and shielding window glass, thus ensuring the ability of anti-electromagnetic radiation interference.
They are able to adopt the optic fiber communication back- stage, thus avoiding data transmission losses from electro- magnetic interference.
The use of high-precision SF₆ density algorithm ensures that the background monitoring data coincides with those field instructions.
They are compatible with ordinary SF₆ remote products . They do not need other modifications in strong interference occasions.
The temperature compensation device ensures higher meas- urement accuracy.

Technical Parameters for Remote Module

Power supply	24V DC	Anti-electromagnetic interference	IEC61000-4-2 IEC61000-4-3 IEC61000-4-4 IEC61000-4-5 IEC61000-4-6 IEC61000-4-8 IEC61000-4-9 IEC61000-4-10 IEC61000-4-12 IEC61000-4-17 IEC61000-4-29	level 4/A level 4/A level 4/A level 4/A level 3/A level 5/A level 5/A level 5/A level 4/A level 3/A 0.1s/A	(8KV/15kV) (30V/m) (4KV) (+/-2Kv) (10V) (100A/m) (1000A/m) (100A/m) (4KV) (10%UN) (40%UT/70%UT)
Power consumption	< 2W
Communication mode	RS485
Protocol	ModBus RTU
Baud rate	9600bps

Technical Parameters

Technical Parameters
Case diameter	100mm
Scale range	-0.1 ～ 0.9MPa (customizable)
Accuracy	±1.0%FS（+20±1℃) , ±1.8%FS（-20℃~ +60℃)（gas phase）
Degree of protection	IP65
Ambient conditions	-20° C ～ +60° C, relative humidity ≤ 95%RH
Leakage rate	≤ 1×10-9 Pa·m3/s (Helium leakage inspection)
Process Connection	M20 × 1.5, (customizable)
Installation method	Radial or Axial
Electrical connection	Plug-in connection M20 × 1.5 sealing head cable size: 1.5mm2 recommended, upper limit 2.5mm2
Contact insulation performance	Insulation resistance: >100MΩ (DC 500V) Withstand voltage: 2kV, 50/60Hz, 1min
Contact type	Magnetic snap-action switch 80%Ag, 20%Ni, 10µm Gold plated
Impact rating	50g (oil-filled), 30g (non-oil-filled)
Contact electrical parameters	30W/50VA, 1A (upper limit) 220VDC/380V 50/60Hz (upper limit)
Watch glass	Laminated safety glass
Weight	≈ 1.2kg
Pressure element	Bourdon tube

Oil-filled.
Measuring medium: SF₆, Air, N₂, SF₆ + N₂ and other gases.
Wide temperature range ：Optional-40℃~ +60℃ or -60° C ~ +60° C.
Optional measurement accuracy：±1.6%FS（+20±1℃) ±2.4%FS（-20℃~ +60℃)（gas phase）.