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HM100PR Density Monitors

HM100PR Density Monitors are used to monitor SF6 gas den- sity 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 spe- cifically designed for over 500kV EHV grade application field, adapting multi-level 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）.