HYDAC賀德克傳感器一級代理
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HYDAC pressure sensor wiring has always been one of the procurement process consulting clients have the most problems, many customers do not know how to connect sensors, in fact, a variety of sensors wiring are basically the same, pressure sensors generally have two-wire, three-wire , four-wire system, and some have a five-wire system.
HYDAC pressure sensor is relatively simple two-wire, generally customers know how wiring, a cable to connect the positive power supply, and the other line is a signal line connected to the instrument through the negative power supply, this is the most simple, three-wire pressure sensor is based on the two-wire plus a line, this line is directly connected to the negative power supply, compared with two-wire a little trouble. Four-wire pressure sensor must be two power inputs, the other two signal outputs. Four-wire voltage output instead of mostly 4 ~ 20mA output, 4 ~ 20mA called pressure transmitter, most made of two-wire system. Some of the pressure sensor output signal is not amplified, only a few dozen mV full-scale output, and some internal pressure sensor amplification circuit, a full-scale output to 0 ~ 2V. As to how to the display meter, depending on the range of the instrument is how much, if any, and the output signal compatible gear, it can be measured directly, or to add signal conditioning circuitry. Five-wire and four-wire pressure sensor or less, five-wire sensor market is relatively small.
HYDAC賀德克傳感器一級代理
螺紋類型
HYDAC壓力傳感器的螺紋有很多種,常見的有NPT、PT、G、M,都是管螺紋。
NPT 是 National (American) Pipe Thread 的縮寫,屬於美國壓力傳感器標準的 60 度錐管螺紋,用于北美地區.國家標準可查閱 GB/T12716-1991
PT 是 Pipe Thread 的縮寫,是 55 度密封圓錐管螺紋,屬惠氏壓力傳感器螺紋家族,多用於歐洲及英聯邦國家.常用於水及煤氣管行業,錐度規定為 1:16。國家標準可查閱 GB/T7306-2000
G 是 55 度非螺紋密封管螺紋,屬惠氏壓力傳感器螺紋家族.標記為 G 代表圓柱螺紋。國家標準可查閱 GB/T7307-2001
M 是公制普通螺紋,如M20*1.5表示直徑為20mm,螺距為1.5,如客戶無特殊要求,壓力傳感器一般為M20*1.5螺紋。
另外螺紋中的1/4、1/2、1/8 標記是指螺紋尺寸的直徑,單位是英寸。行內人通常用分來稱呼螺紋尺寸,一寸等于8分,1/4 寸就是2分,如此類推。G 好像就是管螺紋的統稱(Guan),55、60度的劃分屬于功能性的,俗稱管圓。螺紋由一圓柱面加工而成。
ZG俗稱管錐,即螺紋由一圓錐面加工而成,一般的水管壓力接頭都是這樣的,老國標標注為Rc
公制螺紋用螺距來表示,美英制螺紋用每英寸內的螺紋牙數來表示,這是壓力傳感器螺紋zui大的區別,公制螺紋是60度等邊牙型,英制螺紋是等腰55度牙型,美制螺紋60度。公制螺紋用公制單位,美英制螺紋用英制單位。
管螺紋主要用來進行壓力管道的連接,其內外螺紋的配合緊密,壓力傳感器管螺紋有直管與錐管兩種。公稱直徑是指所連接的壓力管道直徑,顯然螺紋大徑比公稱直徑大。 1/4,1/2,1/8是英制螺紋的公稱直徑,單位是英寸。
HYDAC賀德克傳感器一級代理
HYDAC壓力傳感器正確安裝方法:
(1) 通過適當的儀表, 在普通大氣壓和標準溫度條件下,核實壓力傳感器的頻率反應值。
(2) 核實壓力傳感器的編碼與相應的頻率反應信號的正確性。
2. 確定具體安裝位置
為了確定壓力傳感器的編號和具體安裝位置, 需按充氣網的各個充氣段來考慮。
(1) 壓力傳感器必須沿著線纜進行安裝, 安裝在線纜接頭處。
(2) 每條線纜裝設壓力傳感器不少于4個, 靠近局的兩個壓力傳感器, 相距不應大干200m。
(3) 每條線纜的始端和末端分別安裝1個。
(4) 每條線纜的分支點應裝1個, 如果兩個分支點相距較近(小于100 m),可只裝1個。
(5) 線纜敷設方式(架空、地下)改變處應裝1個
(6) 對無分支的線纜, 因壘線的線纜程式*, 壓力傳感器的安裝隔距不大干500m, 并使其總數不少于4個。
(7) 為了便于確定壓力傳感器故障點, 除在起點安裝壓力傳感器外,距起點150~200m處,還要另外安裝1個當然在設計中, 一定要考慮經濟與技術的因素, 在不需要安裝壓力傳感器的地方,則應不必安裝。
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