Matsushima Measure Tech Co. Ltd. MWLM-PR26 Manual De Usuario
2
1. Overview
Microwave level meter measures level of bulk solids and liquids in the storage vessels without physical
contact to measuring material. This model of level meter doesn't need separate output unit, which 4..20mA
current output signal is carried by same two wires for power supply.
contact to measuring material. This model of level meter doesn't need separate output unit, which 4..20mA
current output signal is carried by same two wires for power supply.
2. Measurement principle
The level meter transmits microwaves at constant intervals, and receives echoes (reflection of transmitted
waves) from the surface of material under measurement. The time difference between transmission and
reception of microwave is processed by microcomputer to accurately determine level of stored materials.
waves) from the surface of material under measurement. The time difference between transmission and
reception of microwave is processed by microcomputer to accurately determine level of stored materials.
3. Specifications
3-1.
General Specifications
Table1. Standard specification
Model
MWLM-PR26C1G
MWLM-PR26H1G
MWLM-PR26H3G / F / S
MWLM-PR26H7G / F / S
Applications
For liquid
For powder
Antenna Corn
Small
horn
Horn
Power Supply（※1）
DC 20 to 32V
Power consumption
Max. 704mW
Mounting（※2）
G2 screws
G1 screws
G：G1 1/2 screws
F：JIS5K65A flange
S ： JIS10K100A swiveling
flange
F：JIS5K65A flange
S ： JIS10K100A swiveling
flange
G：G1 1/2 screws
F：JIS10K100A flange
S ： JIS10K100A swiveling
flange
F：JIS10K100A flange
S ： JIS10K100A swiveling
flange
Dead Zone
0.5m below the antenna
0.3m below the antenna
Max Measurable Distance（※3）
10m
35m
70m
Transmitting frequency
Approx. 26GHz
Transmitting cycle
Every 83ms
Bean angle（-3dB）
Approx. 24deg.
(Approx.48deg. side beam)
Approx. 14deg.
(Approx.28deg. side beam)
Approx. 8deg.
(Approx.16deg. side beam)
Resolution
1mm
Allowable Fluctuation Rate
10cm／s
Repeatability
Within 2m or less：±30mm
Within 2m or more：±20mm or ±0.04% of measurement range (Whichever is greater)
Accuracy
（※3）
（※3）
Temp. error
0.06%／10K
Housing
-40∼＋60℃(With LCD：-20∼＋60℃)(Note：1h warm-up operation required at -40℃)
Ambient Temp.
（※4）
（※4）
Antenna
-40 to ＋150℃
Allowable pressure
500kPa
1MPa
G：1Mpa，F：490kPa,S：10kPa G：1Mpa，F：250kPa,S：10kPa
Housing ADC
Material
Antenna PTFE
SUS304
SUS316L
Housing
IP66 (Housing cover and lead outlet must be closed.)
Protection
（※5）
（※5）
Antenna IP67
Lead outlet
1-G1/2 (Applicable size：φ8∼12mm)
Output signal
DC4 to 20mA×1 (Resistive load Max.499Ω)
Integral Time
0∼999s
Mass
Approx. 1.9kg
Approx. 1.6kg
G：Approx. 2.3kg
F：Approx. 4.4kg
S：Approx. 5.6kg
F：Approx. 4.4kg
S：Approx. 5.6kg
G：Approx. 2.7kg
F：Approx. 5.3kg
S：Approx. 6.0kg
F：Approx. 5.3kg
S：Approx. 6.0kg
Accessories（option）
LCD Adjustment unit (GRAPHIC COM2)、Data communication cable (HM-USB-ISO)
PC Adjustment software (MDTM)
※
1) Power supply ripple voltage must be less than 0.2Vp-p.
Noise and surges should not be interfered. (Recommended)
Fig.1. Loop voltage versus loop resistance
900
18 20 20.9 24 32 33
Loop voltage (V)
Loop resist
ance
（
Ω
）
863
499
381
250
0
21.4