Explanation: General purpose pressure gauges use a curved tube which straightens slightly when pressurised. Gearing mechanisms turn a pointer over a scale. Common temperature gauges use a bi-metalic methods to turn a pointer. Typical Use: Measurement which shows correct operation of pumps / filters etc, or indicates a fault / maintenance due. Cautions: Avoid overheating pressure gauges (use a ‘pigtail’ for protection). Avoid vibration of the needle (choose liquid filled gauges). Best calibration when working pressure is at mid-scale. Vent liquid filled gauges once installed to improve accuracy. Connection is 8mm male thread.
