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External PressureExternal Pressure

External Pressure

Regulator (Optional)Regulator (Optional)

Regulator (Optional)

For applications requiring a maximum pressure less than 55 psi, an

External Pressure Reducer (EPR) is available. An EPR allows an

adjustable operating pressure of 10 to 50 psi. If the pressure of the fluid

leaving the unit exceeds the valve setting the relief valve will bypass the

fluid back into the unit to relieve the pressure. The pressure of the system

is determined by the back pressure of the connected equipment and the

flow rate of the recirculating fluid to your application.

Connect the EPR assembly as shown below. Tighten the hose clamps tight

enough to prevent leakage. Do not over-tighten or the clamps will “bite” into

the flexible tubbing and can cause excessive wear.

Inlet Tee Assembly

Connect the outlet tee assembly to the inlet of your application. Connect the

inlet tee assembly to the outlet of your application.

AdjustmentAdjustment

Adjustment

When adjusting the relief valve some leaking may occur, place a container

under the valve during adjustment.

Remove the protective cap and locate a threaded fitting with a slot for a large

screwdriver. Hold the threaded fitting in place and loosen the lock nut on the

valve body until it is almost flush with the threaded fitting. Unscrew the

threaded fitting three to four turns. (If the threaded fitting unscrews

completely from the valve housing, screw it back in two to three turns.)

To simulate blockage, close (or pinch off) the hose between the EPR outlet

tee assembly and your application. Monitor the operating pressure of the HX

unit. Turn the threaded fitting until the desired relief pressure is set (the EPR

valve cannot be set lower than the total back pressure of your instrument, or

flow will not be received).

Tighten the locknut to secure the position of the threaded fitting. Open the

hose between the EPR outlet tee assembly and your application.

Hose Clamps

Outlet Tee Assembly

Pressure Relief Valve

Protective Cap

Flexible Hose

Return

Supply

Pump Type	Centrifugal
Temperature Stability	±0.1°C
Fluid Compatibility	Water, water/glycol mixtures
Safety Features	Over-temperature protection
Display	LCD
Refrigerant	R-404A
Dimensions	Varies by model
Weight	Varies by model

Neslab HX Series User Manual

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