Dead-Weight pressure Gauge is used for checking and adjusting pressure gauges. The pressure is applied via weights which are placed on a weight support. The latter has a piston which acts on hydraulic oil in a pipe system, so that a pressure gauge which is also connected to the system should indicate certain pressures. The device contains a Bourdon gauge with a transparent dial. The display mechanism and the various adjustment opportunities are therefore clearly identifiable. Hydraulic oil is used to transfer pressure.

1. University of Koya
Faculty of engineering
Chemical engineering department
2nd
stage 2015-2016
Title : Dead –Weightpiston gauge
Name : Zhyar Arsalan Abdulrahman
Group : A1
Date of EXP : 24/11/2015
Date of SUB : 8/12/2015
Fluid flow lab

2. Table of content
1- Aim of experiment……………… page 1
2-introduction …………… page 2
3-Procedure ……………… page 3
4-tools……………… page 4
5-Discussion ……………… page 7
6-Refrence ……………… page 8

3. Aim of experiment:
Calibrating the Bourdon gauge

4. Introduction:
Dead-Weight pressure Gauge is used for checking and adjusting
pressure gauges. The pressure is applied via weights which are
placed on a weight support. The latter has a piston which acts
on hydraulic oil in a pipe system, so that a pressure gauge
which is also connected to the system should indicate certain
pressures.
The device contains a Bourdon gauge with a transparent dial.
The display mechanism and the various adjustment
opportunities are therefore clearly identifiable.
Hydraulic oil is used to transfer pressure.

5. Procedure :
- Open the overflow valve
- Remove the transport-cap
- If necessary topping up the hydraulik oil
- Inserting the piston
-To check the zero point of Bourdon gauge, proceed
as follows:
* Press the piston out of the cylinder
using the hand wheel.
* Remove the piston and weight support.
*Adjust the oil level in the open cylinder until the
cylinder is filled up to the edge.
The gauge pressure being tested should now indicate zero, as it is only subject to ambient
pressure.
-After the zero pointof Bourdon gauge hasbeen checked, the weightsupport is re-inserted
into the cylinder of the pressure gauge unit. The piston is then slowly lowered by
unscrewing the counterbalance cylinder until it is freely suspended.
-In order to avoid static friction, set the weight support in gentle rotation. The mass of the
support is 385 g. Taking into account the piston diameter of 12 mm, it is now possible to
read the increase in pressure from Bourdon gauge.
-Other pressures occurring when the weight on the support is increased can be calculated
in exactly the same way. The display of 0.5 bar is achieved by placing a weight with a
mass of 193 g on the support. The other weights weigh 578 g, which is equivalent to a
pressure increase of 0.5 bar each time.

6. Tools:
bourdon
gauge
weight
support
base plate
Weight

7. Discussion:
1- Define the calibrating curve and explain the purpose of it.
A calibration curve is the graphic or mathematic relationship between the
readings obtained in a process and the theoretical value in a calibration. The
relationship is often established as a straight line rather than a curve.
The purpose of the Calibration curve is used to determine the accuracy of the
instrument and to ensure that readings from an instrument are consistent with
other instruments.
2- Draw the calibrating curve between Pm & Pact. then discuss it.
𝑌 = 𝑚𝑋 + 𝑏 𝑚 =
𝑦2−𝑦1
𝑥2−𝑥1
𝑚 = 1.004
𝑌 = 1.004𝑋 + 𝐵

8. Refrence :
http://www.slideshare.net/areesalah/deadweight-piston-
gauge?qid=451d3af9-a97a-4c01-98ee-
4b50f6b1c1bb&v=qf1&b=&from_search=2