美國(guó)FLOWLINE公司2005年新推出的超聲波液位計(jì)，表頭帶LCD顯示，顯示空間高度和實(shí)際液位高，二線制，提供了大量程到10米的非接觸測(cè)量方式。以下是EchoSpan LU81/83/84 超聲波液位計(jì)的特點(diǎn)：

□ 量程3米/5.5米/8米/10米
□ 二線制，4~20mA輸出
□ 探頭材質(zhì)PVDF,耐酸堿腐蝕
□ 窄聲束角0度，支持靜管技術(shù)
□ LCD液晶顯示，按鈕標(biāo)定

FLOWLINE超聲波液位計(jì)的技術(shù)參數(shù)：

量程： LU80  (10cm-3m) 
       LU81:（20cm—5.5m） 
       LU83:（20cm—8m） 
       LU84:（30cm—10m）     
精度：   量程±0.2% 
分辨率：LU80：0.5cm，LU81/LU83: 10cm  LU84:30cm 
聲束寬度：LU80:5cm,LU81/LU83/LU84:7.6cm 
死區(qū):LU80:10cm,LU81/LU83:20cm,LU84:30cm     
顯示單位： 厘米，英寸，百分比
供電電壓：12－28vdc               
環(huán)繞阻抗：600oΩ@24vdc 
信號(hào)輸出：4～20 mA,可以反向 
標(biāo)定：按鈕標(biāo)定或者實(shí)際標(biāo)定 
失效診斷：4 mA,20 mA,21 mA,22mA，或者保持當(dāng)時(shí)數(shù)據(jù) 
過程溫度：－20℃ 至 60℃ 
電子芯片溫度：－40℃ 至71℃ 
壓力：2bar
防護(hù)等級(jí)：NEMA 4X (IP65) 
外殼接口：防水膜 
外殼材料：PC/ABS FR 
探頭材料： PVDF Kynar 
過程連接：LU80 1"NPT(G) 
 LU81/LU83/LU84 2"NPT(2"G)螺紋 
電氣接口： 雙孔 1/2"NPT 
CE認(rèn)證：EN61326EMC

Range: LU80: 4” to 9.8’ (10cm to 3m), LU81: 8” to 18.0’ (20cm to 5.5m), LU83: 8” to 26.2’ (20cm to 8m), LU84: 12” to 32.8’ (30cm to 10m)

Accuracy: ± 0.2% of range

Resolution: LU80: 0.019” (0.5mm), LU81/83: 0.039” (1mm), LU84: 0.078” (2mm)

Dead band: LU80: 4” (10cm), LU81/83: 8” (20cm), LU84: 12” (30cm)

Beam width: LU80: 2” (5cm), LU81/83/84: 3” (7.6cm)

Configuration: Push button

Memory: Non-volatile

Display type: LCD, 6-digit

Display units: Inch, cm and percent

Supply voltage: 12-28 VDC

Loop resist.: 500 Ohms @ 24 VDC

Signal output: 4-20 mA, two-wire

Signal invert: 4-20 mA, 20-4 mA

Signal fail-safe: 4mA, 20mA, 21mA, 22mA or hold last

Process temp.: F: -7° to 140°, C: -20° to 60°

Temp. comp.: Automatic

Ambient temp.: F: -40° to 160°, C: -40° to 71°

Pressure: MWP = 30 psi (2 bar)

Enclosure rating: NEMA 4X (IP65)

Encl. material: Polycarbonate

Encl. hardware: Brass & stainless

Enclosure vent: Water tight membrane

Conduit entrance: Dual, 1/2” NPT

Trans. material: PVDF

Process mount: LU80: 1” NPT (1” G), LU81/83/84: 2” NPT (2” G)

Mount gasket: Viton^®

Classification: General purpose

Compliance: CE, RoHS