This Vacuum Gauge manual provides installation, operation, and maintenance instructions for the CR2 Capsule Dial Vacuum Gauge. You must use the Vacuum Gauge as specified in this manual.
Read this manual before you install your Vacuum Gauge. Important safety information is highlighted as WARNING and CAUTION instructions; you must obey these instructions. The use of WARNING and CAUTION is defined below.
Warnings are given where failure to observe the instruction could result in injury or death to persons.
Cautions are given where failure to observe the instruction could result in damage to the equipment, associated equipment or process.
The units used in this Vacuum Gauge manual conform to the SI international system of units of measurement.
The CR2 Capsule Dial Vacuum Gauge measures the total absolute pressure of gas in a vacuum system. The composition of the gas does not affect the measurement. The Vacuum Gauge is therefore useful in applications where you need to measure the pressure of gasses other than air.
The Vacuum Gauge is barometrically compensated, so that pressure measurements are unaffected by the ambient atmospheric pressure. This is useful when you need to measure low pressures.
Internally, the Vacuum Gauge has a sealed, evacuated capsule with a mechanical linkage which operates the pointer on the dial. The capsule is enclosed in the case of the Vacuum Gauge.
The case of the Vacuum Gauge is open to the vacuum system and is sealed from the atmosphere by a sealing ring, which is clamped under the safety glass by a screwed bezel.
Dimensions See figure 1
Mass 0.9 Kg
vacuum Connection 3/8” BSP Brass Demountable 8mm Liner
Internal volume 210 CM
Materials exposed to vacuum Aluminium, Inconel X750, Glass, Stainless Steel, Nitrile and Copper alloy.
Operating temperature range 10 to 50°C
Accuracy at 20°C ± 2% of full scale deflection
Leak rate into Vacuum Gauge at a Differential pressure of 1 bar <1x 10 – 5 Mbar. Ls – 1
Unpack and inspect
Remove all packing materials and protective covers and check the Vacuum Gauge.
If the Vacuum Gauge is damaged, notify your supplier and the carrier in writing within three days, stating the part and serial number of the Vacuum gauge including your order number and your suppliers invoice number. Retain all packing materials for inspection. Do not use the Vacuum Gauge.
If the Vacuum Gauge is not to be used immediately, replace the protective covers. Store the Vacuum Gauge in suitable conditions, as described in the section Storage and Disposal of Vacuum Gauge.
Mounting the CR2 Vacuum Gauge
Mount the Vacuum Gauge as close as possible to the point in the vacuum system at which you wish to measure the pressure. Do not use a narrow pipeline or incorporate angled connections, as these may cause errors in the pressure measurement.
You can mount the Vacuum Gauge so that it is supported by the vacuum connection. If you mount the Vacuum Gauge in this way, make sure the pipeline which connects the Vacuum Gauge to the vacuum system is as short as possible and that very little vibration can be transmitted to the Vacuum Gauge.
Alternatively, you can fit the Vacuum Gauge so that it is panel mounted. If you wish to fit the Vacuum Gauge on a panel the panel must be at least 2mm thick. Use the procedure below.
- Cut a Ø111mm to Ø112mm hole in the panel where you wish to mount the Vacuum Gauge.
- Push the rear of the Vacuum Gauge through the hole and fit the clamp over the bolts as shown in Figure 1.
- Secure the Vacuum Gauge in place with two wing nuts.
Connect to the vacuum system.
The Vacuum Gauge has a Ø8mm pipe union connection fitted as standard. Braze the brass tailpiece of the pipe union to the Ø8mm copper pipe in your system.
Alternatively, if the Vacuum Gauge has been supplied with a KF16 flange then connect the Vacuum Gauge to the system using the KF16 fitting.
Leak test the installation.
Leak-test the vacuum system after installation of the CR2 to prevent leakage of hazardous substances out of the system and leakage of air into the system.
Leak test the vacuum system after you have installed the Vacuum Gauge. Hazardous substances which leak from the system may be dangerous to personnel and there may be a danger of explosion if air leaks into the system.
Do not allow the internal pressure to be higher than 1 bar gauge (2 bar absolute). If the pressure in your system can be higher than 1 bar gauge, you must fit a suitable pressure relief valve.
Dust or solid particles in the vacuum system can enter the gauge mechanism and cause the CR2 to malfunction.
Do not use the CR2 to measure the pressure of process gases which are corrosive or have a high concentration of water vapour. If you do, you may get incorrect pressure measurements and you may damage the CR2
Once you have installed the Vacuum Gauge as described in the section Installation of Vacuum Gauge, the measurement shown on the dial of the Vacuum Gauge will indicate the total pressure in your vacuum system.
The CR2 Capsule Dial Vacuum Gauge contains no parts which can be serviced by the user.
An exchange or replacement service is available if your Vacuum Gauge is damaged.
Contact your supplier for further information.
The CR2 Capsule Dial Vacuum Gauge must be calibrated regularly to maintain accuracy (specified in the section Technical Data).
A calibration service is available. Contact your supplier for further information.
Store the Vacuum Gauge in cool dry conditions until required for use. When required prepare and install the Vacuum gauge as described in section Installation.
Dispose of the Vacuum Gauge and any of its components removed from it safely in accordance with local and national safety requirements.
Description Product Code
KF16 Stainless Steel adaptor 100-3-047
KF16 Brass Vacuum Gauge adaptor 100-3-048
KF16 Stainless Steel centering ring 400-4-017-02
KF16 Aluminium swing clamp CL16
1/8” NPT Brass Vacuum Gauge adaptor 100-3-011-049
3/8” BSP brass demountable 6mm liner 100-4-025
3/8” BSP brass demountable 6mm liner 100-3-015
Chemical Resistant capsule dial Vacuum Gauge
Stainless Steel flexible hoses, bellows and fittings
Design and manufacture of vacuum systems