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您的压力计performs an important role in your application, and if it stops working then your entire process can come to an abrupt halt. If you replace it with the wrong gauge, it can cost you time, money and the safety of your personnel.
用最合适的匹配代替压力表将确保您的过程可以安全有效地运行。但是，您如何确定现有的仪表以及应该购买的替代品？
我们的产品和销售团队几乎每天都会听到这个问题，因此本文将概述许多方法来识别您的规格并找到合适的替代品。
Not All Pressure Gauges Are the Same
与车辆的VIN（供应商识别号）不同，它提供了完整的产品细节，压力表通常提供的不过是引用制造商，品牌或家庭模型。您很快会发现它们由许多元素组成，尽管其中一些藏在仪器中。
Just as your favorite coffee stands out from the rest, you will find that your gauge is not just a gauge. Though the customer may offer a product photo or limited description, this isn’t enough. I usually need to ask a few questions to properly source a replacement.
识别压力表的7个步骤
I’ve helped customers with their压力仪器多年来的担忧以及我使用的量规选择过程可以帮助他们找到长期运行并保持业务运作的适当仪表。
让我们讨论要问哪些问题以及识别量规所需的信息。
我经过这些步骤，以帮助确定客户所拥有的量规，确保其使用它的用途足够，然后建议进行合适的替代品。Of course, these aren’t all the factors to consider, but it’s a useful guide to get you started.
1. Case (Enclosure/Housing)
这是什么材料？仪表案例通常有黑色铝，不锈钢，酚类，塑料，黄铜或其他材料以满足行业规格和/或需求的材料。
过去，黄铜是高度首选的，因为它对海洋应用非常有弹性，尽管成本上涨影响了其替代材料的替代。
此外，316升不锈钢已成为化学，食品和饮料以及卫生装置的普遍要求。
接下来是情况的结构设计。它有一个吗solid front还是打开前面？这与仪表是否（固体）（固体）（打开）是否具有整体墙（固体）的内容有关，这与表盘脸后面的表壳合并在一起。
Most gauges do not require a solid front as most are for general pressure measurement, yet it offers additional operator safety and a more rugged enclosure if there are extreme pressure spikes that can lead to the rupturing of the gauge system.
The overpressure is projected out of the back of the gauge case and directed away from the operator. Solid-front gauges are common within refineries and chemical plants where there is a heightened concern for process media.
2.振动和脉动保护
Another feature often overlooked is whether the gauge is liquid-filled and/or has a throttling device. Why are these important? Each protects the measuring instrument; liquid fill dampens the effects of vibration, whereas a throttle plug/screw dampens pressure fluctuations.
您怎么知道这些是否存在？如果仪表上有实心填充塞，并且填充液的水平通常覆盖量的90％，则可以验证液体填充。液体填充可保护仪表运动免受过度磨损的影响，否则会导致读数不准确，并增加了维修/更换成本。
Be sure that the selected fill fluid is compatible with the process media – the most common fill fluids are glycerin, silicone or halocarbon.
You can see if a unit has a throttling plug/screw installed by looking into the process port; this feature is used to keep process pulsation from affecting the gauge.
3.污染控制
要更换量规，请确保确认压力系统的湿材料与过程媒体完全兼容。
Our腐蚀指南可以协助您的选择过程。
通常，压力系统的湿材料印在表盘和/或仪表套筒上。
4.准确性
检查仪表的量规面（表盘）。有多少个毕业和数字间隔？这将有助于验证仪表准确性。
Most gauges meet eitherASMEB40.100或EN 837-01 - 两个标准指导拨号毕业数和数字间隔的数量。
Remember, a greater number of graduations/figure intervals means higher instrument accuracy.
此外，带有镜带沿拨号边缘的单元是测试仪的典型特征，它们还将带有一个精美的“刀边”指针。
5.连接大小
You will soon realize that pressure gauges offer a wide variety of pressure connections. The most common standard for the U.S. is NPT (National Pipe Thread). You should know the thread type to ensure proper installation and prevent potential damage due to galling or cross-threading.
通常，量规拨号的大小是了解公共压力连接大小的指南。1½至3½英寸的经济仪表通常提供1/8 NPT至1/4 NPT，而4½英寸或更大的表盘尺寸可提供1/4 NPT至1/2 NPT。
被识别为工艺测量值的模型的拨号尺寸为4½英寸，较大，通常提供支持该仪器的1/2 NPT。
6. Connection Location
Where is the mounting location on your instrument? Is it lower or back/rear connected, or does it have a special orientation such as 3, 9 or 12 o’clock? Additionally, you should be aware of space restrictions that will limit installation.
更换量规时，请考虑以下安装选项：
- STEM坐骑：提供较低的连接量表
- Wall/surface mount: offered with a lower connect gauge
- 面板安装座：提供后连接量表
- U-clamp flush mount: offered with a back connect (panel mount installations) gauge
- 前法兰冲洗安装座：提供后连接（用于面板安装）仪表
7.压力范围
确认表盘压力范围和仪表量度的单位。这还应有助于确定步骤3中提到的准确性。替换仪表时，请考虑ASME B40.100建议将正常的工作压力限制在选定范围的25％至75％。
However, in the event of pulsation, the maximum recommended operating pressure should not exceed 50% of the full-scale range.
更换量规的考虑
在寻求量规替换时，获得相同的工具不应是您的唯一考虑因素。
Many people don’t know the ins and outs of the product. Your gauge may have been specified incorrectly or you could have received improper guidance when you made your purchase.
并非每个客户都知道最初订购的量规。他们可能没有订购它 - 分销商或其他第三方可以将其出售给他们。
Make sure you buy new and not used instruments. Questionable instrument reliability/integrity and contaminants can present a serious risk to your processes and cost you money or downtime.
My suggested gauge for the customer is the closest I can get to satisfy the application.没有信誉良好的压力仪器制造商可以100％确定地告诉您他们建议的替换表是一个完美的匹配，但是在遵循设定的指南时，您应该更有信心。
We don’t like to pressure you, but we have more information.
Now that you know more about identifying a gauge and finding the right replacement, do your due diligence and make sure you are working with a trusted industry expert to find the best options for your application.
今天随时与我们联系与我们的一位行业专家交谈在Ashcroft，在回答所有压力表的问题上。我们可以帮助您找到正确的替换量表。
如果您想了解更多有关压力计s, take a look at our资源中心for guides, white papers and webinars, or read some recent articles we’ve posted on the subject:
