The Pressure Relay transforms pressure signals into electrical signals to enable the liquid/electrical system adjust by itself and automatically alert the staff in case of an emergency suitable for use in normal environments with oil, gas and water. The instrument can adjust pressure, responds quickly and is equipped with light indicators. Its technical specifications follow under 2 quality categories the JB/JQ2020-88 standard.
The pressure relay had patented a practical use new pattern technology, patent number: 91-65222, and is appropriate for mechanical, extraction mining petrol chemical and other industries with automation and self alert system.

Serial code：

Specification：

Adjustment range MPa	Minimum breaking pressure MPa	Maximum breaking pressure MPa	Sensitivity %	Repeated accuracy %	Switch accuracy %	Maximum allowed interruption per minute
0-1.0	0.065;0.005	1.0;0.97	≤3	≤1.2	<1	30
1-32	0.7;0	32;31	≤2	≤0.5	<1	30

Operational temperature：-25℃~70℃
Operational medium stickiness ability degree：2.8~380 cst
Safeguard grade：IP54
Operational voltage：24V-；110V-；220V~
Switch life：300 thousand switches
Connection screw thread：M14×1.5
Design： JB/T6802-1993

Dimension：

Connection schematic diagram:

Ordering：
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How to adjust flow interruption pressures:
When adjusting PD-H-L₁, first choosing the screw nut by twisting it in counterclockwise direction, then after the pressure has been increased to the specified value, twist the screw nut in counterclockwise direction to activate the trigger, when the indicator lights up lightly close and lock the screw nut, again adjust until the signal is correct, then close and lock the screw nut.
The PD-H-L2 is adjusted as above. The upper limit adjustment screw is near to escutcheon, should adjust the upper limit then the lower limit.
The operational environment should not have corrosive gas.
Name/Model/Adjustment pressure range/Operational source of electricity