Sentec - Model SRM900 - Magnetostrictive Level Transmitter
From Level Measurement - Magnetostrictive
The structural part of the magnetostrictive liquid level sensor is composed of a stainless steel tube (a measuring rod), a magnetostrictive wire (waveguide wire), a movable float (with a permanent magnet inside), and the like. When the sensor is operating, the circuit portion will excite a pulsed current on the waveguide wire that will generate a pulsed electromagnetic field around the waveguide wire as it propagates along the waveguide wire.
Overview
A float is arranged outside the sensor rod, and the float can move up and down along the rod as the liquid level changes. There is a set of permanent magnetic rings inside the float. When the pulsed current magnetic field meets the magnetic ring magnetic field generated by the float, the magnetic field around the float changes so that the waveguide wire made of magnetostrictive material generates a torsional wave pulse at the position where the float is located. This pulse is along a fixed speed. The waveguide wire is transmitted back and detected by the detection mechanism. By measuring the time difference between the pulse current and the torsional wave, the position of the float, that is, the position of the liquid surface, can be accurately determined.
Specifications
- Power supply: 24V±2. 4V. DC
- Working temperature
- Electronic part: -40 ° C ~ +80 ° C
- Rod part: -40 ° C ~ +110 ° C
- Range Hard rod: 150mm~7000mm, soft rod: up to 20000mm
- Output form: 4~20mA; 0~5V; 0~10V; ±5V; ±10V; RS485 Linearity error: better than ±0.05% FS; sensor with a range less than 300mm, error less than 150 um
- Repeatability: better than ±0. 002%FS
- Output temperature drift : 50ppm/°C
- Product power consumption: ≤ 50mA
- Output ripple: ≤ 20mV
- Dead zone
- Soft rod: upper dead zone: 100mm, lower dead zone: 300mm
- Hard rod: upper dead zone: 51mm, lower dead zone: 36mm, with black line logo (can be modified according to customer requirements)
- With load capacity: 4~20mA output; with load capacity ≤ 500 Ω;0~5V, 0~10V output: minimum controller load ≥5kΩ
- Rod material: 0Cr18Ni9, 1Cr18Ni9Ti or user-specific customization
- Electronic casing material: 1Cr18Ni9TiLead mode
- Shielded cable connection, the default length is 1.5m (special size can be customized)
- Aviation plug connection
- Terminal connection;Float material 0Cr18Ni9, 316, rubber Installation form threaded installation, connector installation, positioning ring installation, suspension installation or special customization
- Type of explosion protection ExdIIBT5, Exial IBT5, Exdl ICT5 Protection level IP65