压力、绝压、差压、流量和液位变送器，量程 1mbar ～ 400 bar

不同的要求需要不同的变送器。

带有不同的连接选件和不同的外壳 – 带或不带显示屏。

不论是常规操作、智能操作，还是通过 PROFIBUS PA 或基金会现场总线进行操作 -SITRANS P均能为用户提供极大的便利性和出色的性能。

 

Z 系列：

• 单量程变送器，仅适用于压力和绝对压力
• 标准量程
• 不锈钢型，带有DIN插头

P250系列：

• 单量程差压变送器
• 模拟量电子器件
• 可以提供全进口型和国内组装型

P紧凑型系列：

• 单量程变送器
• 标准量程
• 卫生设计
• 可提供不同的无菌连接系列

P280 系列：

• 使用 WirelessHART 进行无线通信
• 蓄电池电源
• 通过无线 HART 手操器，利用 SIMATIC PDM 或在本地利用 HART 调制解调器，并使用本地按钮，可进行参数设置。

P300系列：

• 智能操作和常规操作
• 卫生设计
• 可提供不同的无菌连接系列
• 带有 ATEX、FM 和 CSA 认证

P300系列 (PROFIBUS)：

• 通过 PROFIBUS-PA 操作
• 卫生设计
• 可提供不同的无菌连接系列
• 带有 ATEX、FM 和 CSA 认证

P300系列（基金会现场总线）：

• 通过基金会现场总线操作
• 卫生设计
• 可提供不同的无菌连接系列
• 带有 ATEX、FM 和 CSA 认证

DS III 系列：

• 智能操作和常规操作
• 更适用于水平差压管线
• 1 区或 2 区本质安全或隔爆型外壳
• 带有 ATEX、FM 和 CSA 认证

DS III PA（PROFIBUS）系列：

• 通过 PROFIBUS-PA 操作
• 更适用于水平差压管线
• 1 区本质安全或隔爆型外壳
• 带有 ATEX、FM 和 CSA 认证

DS III FF 系列（基金会现场总线）：

• 通过基金会现场总线操作
• 更适用于水平差压管线
• 1 区本质安全或隔爆型外壳
• ATEX 认证

MPS 系列（潜水式传感器）：

• 静压液位测量变送器

Integration

Measuring setups with remote seals

The following pages show examples of typical measuring setups for using SITRANS P pressure transmitters with and without remote seals.

Installation

Remote seals of sandwich design are fitted between the connection flange of the measuring point and a dummy flange.

Remote seals of flange design are fitted directly on the connection flange of the measuring point.

The respective pressure rating of the dummy flange or the flanged remote seal must be observed.

The pressure transmitter should always be installed below the connection flange (and always below the lower connection flange in the case of differential pressure transmitters). When measuring at pressures above atmospheric, the pressure transmitter can also be installed above the connection flange. When measuring at pressures below atmospheric, the transmittermustalways be installed below the connection flange (and always below the lower connection flange in the case of differential pressure transmitters).

Offset of measuring range

If there is a difference in height between the two connection flanges when measuring with two remote seals, an additional differential pressure will result from the oil filling of the remote seal capillaries. This results in a measuring range offset which has to be taken into account when you set the pressure transmitter.

An offset of the measuring range also arises when pressure transmitters and remote seals are not installed at the same height

Pressure transmitter output

If the level, separation layer or density increase in closed vessels, the differential pressure and hence the output signal of the pressure transmitter also increase.

If the output signal is to fall as the differential pressure rises, you must swap the start of scale with the end of scale.

With open vessels, a rising pressure is usually assigned to an increasing level, separation layer or density.

Influence of ambient temperature

The capillaries between the remote seal and the pressure transmitter should be kept as short as possible to obtain a good transmission response. Steps should also be taken to avoid temperature differences between the inpidual remote seals.

If the complete setup is exposed to temperature variations, temperature errors will result from the thermally induced change of volume of the filling liquid in the capillaries, in the remote seals and in the connection parts.

Notes

When measuring separation layers, ensure that:

• The separation layer is positioned between the two spigots.
• The level in the vessel is always above the top spigot.

Possible combinations of pressure transmitters and remote seals

Type of installationPressure transmittersRemote seals

A / B	7MF4010 7MF4013 7MF4033 7MF4034 7MF4035 7MF8023 7MF8024	7MF4900 7MF4910 7MF4920
C1 / C2	7MF4233 7MF4234 7MF4235	7MF4900 7MF4910 7MF4920 (vacuum-proof design in each case)
	7MF4333 7MF4334 7MF4335	7MF4901 7MF4921
D	7MF4433 7MF4434 7MF4435	7MF4903 7MF4923
E	7MF4433 7MF4434 7MF4435	7MF4913
G / H / J	7MF4433 7MF4434 7MF4435	7MF4903 7MF4923