Operating instructions – Gentec-EO HP User Manual

Page 10

Version 2.2

HP Series Instruction Manual

2 OPERATING INSTRUCTIONS

In order to ensure a long lifetime of accurate measurements, it is recommended that HP is

held within the following ambient conditions:

Storage environment temperature: 10 to 65°C, RH < 90%

Operating environment temperature: 15 to 28ºC, RH < 80%.

It is possible to store and operate your Gentec-EO UP wattmeter beyond this range. For any
specific requirement, please contact your local Gentec-EO representative.

Connect the detecting head (equipped with 3/8’’ tube push to connect fittings) to a water

cooling supply.

NOTE: Ensure that the connection is water-tight by cutting the end of the tube
perpendicular to the tubing. The portion of the outer tubing wall that slips into the fitting must
not be deformed or damaged.

 To connect the detector head fittings to the water supply tubing: push the tubing

into the fitting until it comes to the end.

 The direction of flow through the head is very important. The measured

power will be negative if the direction is inverted.

 Once you have connected the fittings, check them for leaks. If you find a leak,

check to see if the tubes are pushed in far enough and that the tubing has not
been damaged.

 To disconnect the detector head fittings, remove the water pressure and drain

the water from the tubing. Press the black part of the fitting and pull out the
tubing.

NOTE: Water will usually remain in the detector head after it is disconnected. It is possible
to remove it by blowing it out, but be careful not to blow the water on yourself or on the
detector aperture. Dry the detector body and absorber off before storing it.

 Be sure that flow rates satisfy the minimum values, as indicated on the

specifications page.

 Time variations in water flow rates or water temperature will cause

corresponding oscillations in measurements.

 The water temperature and flow rate can be monitored with the PC

interface PC-HP.

For the most accurate measurements, center the beam on the sensor face. The beam
diameter on the sensor should ideally be the same size as the beam diameter of the original
calibration, which corresponds to >98% encircled power centered on 70-90

% of the sensor’s

surface (this complies with the International Electrotechnical Commission standard #1040:
"Power and Energy Measuring Detector..."). Refer to the calibration certificate for the exact
calibration beam diameter.