This Product is discontinued, please contact us if you are still interested. An alternative is e.g:

This Product is discontinued, please contact us if you are still interested.

The X911 (Xnine eleven) meter in combination with the UV-3718-4 detector forms a compact hand-held radiometer for the measurement of irradiance and irradiance dose of monochromatic optical radiation at 254nm. It has now been superseded by the X1-1-UV-3718 UVC radiometer which offers improved performance and greater functionality.

Measurement of UV-C254nm irradiance of low pressure mercury lamps used in germicidal & bactericidal sterilization and eprom eraser

The UV-3718-4 detector is designed for the measurement of high intensity ultraviolet radiation at 254nm. For long time stable operation with short wavelength high energy radiation the detectors diffuser, its band pass filter and photodiode are pre-aged by UV radiation. Beside that the front of the detector and its cable are protected with stainless steel plate and stainless steel spiral tube.

Simple to Use Lightmeter

The X911 meter is a handheld battery operated meter with 9 mm high character LCD display for easy viewing. It offers a wide dynamic amplifier with seven automatically or manually selected gain ranges. Operating the X911 is simple you only need to switch on the meter and select the measurement mode. The meter is operated by a standard 9V battery. An BHO-11 hard-shell case is optional available.


Two meter versions were previously offered:

X911 with display in mW/cm²
X911u with display in µW/cm²

Both variants are now superseded by Model X1-1-UV-3718

Traceable Calibration

The detector and the meter are traceable calibrated to international standards.

Custom Labeling Welcome

X1-1-UV-3718 UVC 254nm radiometer supersedes X9-11 models

UV-3718-4 Typical Spectral Responsivity


Compact size hand-held housing


6 character LCD, Character height 9mm. Indication of measurement quantity, cw or peak measurement mode, automatic or manual gain, run/stop, low battery

Detector interface

ITT (-4) type connector


With Run / Hold function (Snapshot)

CW integration time

300 ms

Frequency Range

0.166 Hz to >300MHz

dose measurement

Manual controlled with RUN / STOP buttons

Dose integration time

100 ms

Parameter adjustment

Via RS232 interface

Front panel control

3 button system


RS232, 9600 Baud, 8 8D pin plug Hirose type 3260-8S1, Power supply option recommended for remote control operation

temperature range

Operating: 5 to 40°C, storage: -10 to 50° C


37mm diameter, 32mm height, 12mm cosine diffuser diameter, 2m cable length, 100 g

Power Supply

9V one-piece battery, operating time about 100 hrs
Operation from AC plug-in power supply 230V/50Hz on option by erase of battery

UV-3718-4 Detector

For detail information please check the UV-3718 datasheet

Irradiance Range

With X911 0.002 to 8000mW/cm² 
With X911u 2 to 999999 µW/cm²

Irradiance Dose Range

With X911 0.05 to 999999 J/cm² 
With X911u 50 to 999999 mJ/cm²


With monochromatic reference light source at 254nm




12 month

Measurement modes NULL
Type Description File-Type Download
Datasheet X9-11 + X9-11u PDF
Produktname Product Image Description Show product
UV-3718 Detector head for the measurement of high irradiance of UV-C 254nm radiation in W/m².

Features: pre-aging for long time stability, cosine field-of-view, metal shielded cable, for the usage with optometers and amplifiers, calibration certificate.

Article-Nr Modell Description Request / Compare
100559 X9-11

Meter (mW/cm²)with battery and manual

15297858 X9-11u

Meter (µW/cm²)with battery and manual

15298020 X9-11u Set

Meter X9-11u, detector UV-3718-4, case BHO-11, battery and manual

15300700 K-X9n-C

Electronic calibration of X9 series meters

15300669 K-UV3718-S

Irradiance calibration using monochromatic reference source at 254nm, Calibration certificate

15297129 UV-3718-4

UV-C (254nm) irradiance detector; Calibration certificate

100065 X9-Z01

RS232 interface adapter cable to connect X9 series meters with 9PIN SUB-D standard sockets to PCs

100299 X9-Z02

External power supply for X9 series meters including meter modification (cancels battery operation)

101122 X9-Z05

Plug-in power supply for AC operation of X9 series meters. Connects to RS232 socket of the meter (prevents remote control operation via RS232 interface). 100VAC - 240VAC; 5VDC

15297539 BH0-11

Hard case to carry and store the X9-11 with one UV-3718-4

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