Mechanical oil gauges, when correctly installed according to specifications, ensure sufficient accuracy when measuring diesel flow rates. The cumulative value accuracy typically reaches 0.5 grade, making it a relatively accurate flow measurement instrument. However, if the flow rate of the medium being measured is too low, the instrument's leakage error becomes prominent, and it can no longer guarantee adequate measurement precision. Therefore, different models and specifications of diesel flow meters have an allowable minimum flow rate. Measurement accuracy can only be ensured when the actual measured flow rate exceeds this lower limit.
Installation environment requirements for mechanical oil gauges:
Choose a location with minimal dust, free of corrosive gases, no severe vibration, and far from heat sources as much as possible.
2. Flow meter installation environment temperature is -15 to 40°C.

Technical requirements for mechanical oil gauge installation:
1. The elliptical gear flow meter has no specific requirements for the upstream and downstream straight pipe sections. It can be installed horizontally or vertically. When installing, ensure the rotation axis of the flow meter's elliptical gears is parallel to the ground.
2. During on-site installation, pay attention to the arrow direction on the flowmeter housing and the direction of fluid flow.
3. The fluid to be tested should not contain particles or impurities; otherwise, a filter must be installed before the flowmeter's inlet. If the fluid contains a large amount of debris, the filter diameter should be one size larger than the standard or a parallel dual filter should be installed. If gas is present, an exhaust device should be installed.
4. The fluid under test should fill the measuring chamber of the flowmeter and its connecting pipes before and after. If the fluid contains gas, a gas separator should be installed before the flowmeter and filter.
5. Flowmeters should be installed on pipes with a nominal inner diameter identical to their inlet and outlet connections. When connecting the pipe to the flowmeter, the sealing components should not protrude into the fluid stream.
6. For continuous operating pipelines, a bypass pipeline should be installed when the flowmeter is mounted on a horizontal pipe to facilitate cleaning and maintenance; when the flowmeter is mounted on a vertical pipe, it should be installed in the bypass pipeline to prevent debris from entering the instrument. When the fluid flows from bottom to top, the vertical pipe above the flowmeter should be as short as possible to minimize sedimentation of impurities in the upper piping.

Primary Function of Mechanical Oil Gauge:
1. This product combines liquid level detection and display in one, without the need for any external devices, and can directly display the liquid level. Easy to install, it is widely used on fuel tanks, diesel tanks, hydraulic stations, and water tanks of various generators and engines, but is not recommended for use in vehicles.
2. Threaded interface: M45*2 or BSP 1 1/2 NPT 1 1/2
3. Standard Flange Type: Standard 6-hole flange or welded flange.
4. Optional liquid level alarm feature
5. This product is available in standard lengths of 120~740mm, and can be customized to different lengths upon customer request.
6. Operating Temperature: -40°C to +80°C
7. Display Accuracy: 5%
8. Torque Tightening: 300-400 N·m
9. Length Range: 100mm-1500mm, lengths can be customized to customer requirements. Top equipped with a gauge, with a pointer indicating liquid level height.
10. Signal Output: Optional, capable of outputting 9 resistive signals with a resistance range customizable to customer requirements.
11. Alarm Switch: Optional, available in high or low alarm settings. Alarm current less than 500mA. Alarm points can be set at 9/10 and 1/10 positions.