Usb connector 1.2.3. cooling water – Gentec-EO HP User Manual

Page 7

Version 2.2

HP Series Instruction Manual

1.2.2. USB connector

The USB connector allows using the HP on a PC. The PC interface, PC-HP, features statistical
calculation, graphics displays and data logging options. It also gives real time measurement of
the cooling flow rate and temperature.

A standard USB cable of 5 meters is supplied with the HP. If a longer cable is required, please
contact Gentec-EO for more information.

A USB power adapter (201221) can be ordered with the required AC plug ; USA (201222), UK
(201223), European (201224) and Australian (201225).

1.2.3. Cooling water

The fluid used to cool the HP must be clean water.

Water Fittings and tubing :

The HP is equipped with 3/8’’ (OD) tube push to connect fittings.

It must be used with plastic pressure tube systems (like PE tubes).
The fittings is not compatible with copper or stainless steel tubes.

The metric version of the HP is supplied with an adapter kit (201993) for 10 mm tube (OD).



The kit contains two push to connect

3/8’’ to 10 mm tube adapters and two 3/8’’

coupling tube stems.



The coupling stem is inserted between the HP and the adapter.



Please note that the tube size is written on the adapter output (10 or 3/8).

Water Quality:

The HP series cooling fluid must be water, do not use glycol or other additive that changes
the coolant’s heat capacity.

Use filtered (< 10µm) water to avoid any residue.
Gentec-eo can provide an external water filter (202149) if water quality is an issue.

Distilled water can be used, but it is not recommended to use highly deionized ultra-pure
water because the water cavity is not completely inert.

If an algaecide must be used in the chiller, we recommended Optishield Plus or equivalent.

If chloride is present in the system, the concentration should not exceed 25 PPM and the PH
maintained at 7.0.

Water temperature:
-

The cooling water can be between 15 and 25°C but must always remains above the dew
point.

The ideal set point is 20.0°C, where the HP is calibrated.

Water temperature stability is very important since variations (1 to 60 seconds) in the
temperature can be interpreted as laser power fluctuation.

Regulate the temperature with a chiller or a re-circulator.

The water temperature can be monitored with the PC interface PC-HP.

Water Flow rate:
-

Flow rate stability is very important since the measured power is directly proportional to the
flow. Variation (1 to 60 seconds) in the flow rate can be interpreted as laser power
fluctuation.

The flow rate must be adjusted with a valve. A lower flow rate causes a slower response
while increasing the signal to noise ratio. A higher flow rate causes a faster response,
reducing signal to noise ratio.

The water flow rate can be monitored with the PC interface PC-HP.

Note: All these parameters should remain in the range stated in the specifications.