curelog - Simple, precise!
The curelog is a compact radiometer with dose measurement for up to four spectral ranges. It records irradiance and dose in UV belt systems, on spot and area emitters, fibre optics and UV/VIS LEDs – in lacquer curing, bonding, disinfection and lithography. Four 24-bit ADCs work simultaneously at a resolution of 0.0001 mW/cm² and a measuring range of 50 W/cm², so different lamp types can be compared directly. The recording rate reaches 2000 Hz for fast belt systems, the recording time 180 hours for slow low-dose processes.
The display directly shows maximum irradiance and dose. A further application is the adjustment and focusing of the reflector in UV systems. Due to its small dimensions, the curelog can be placed on most objects / surfaces and records the irradiance with pinpoint accuracy.
With the curelog software, measurements can be analyzed, exported and compared. Previously stored reference measurements can be read in and superimposed in a time-synchronous manner. So, changes in the irradiation belt profile, i.e. irradiance over time, are visible. Errors that occur over time, such as dirty reflectors, are reliably and easily detected.
With the curelog DOCK we offer a base station for PLC connection. The peak irradiance and dose are transmitted directly to the PLC. If these are in tolerance, the measurement can be deleted and if not, the measurement can be evaluated with the PC software.
The curelog spectral ranges do not overlap, so crosstalk is not possible. Regardless of whether you use low powered UVC disinfection lamps, high intensity mercury / xenon lamps or LEDs for bonding or medium pressure lamps for UV curing, with the curelog you always measure accurately and reproducibly.
Highlights:
- Multi-channel radiometer with dose measurement
- Cordless and battery operated
- 24-bit precision ADC
- Low height of only 14 mm
- Up to 180 h recording time
- Up to 2000 Hz data storage rate
- Software for measurement comparisons
- Docking station for PLC integration (RS485 & RS232)
| Product type | UV meter: Fast, flat conveyor radiometer and dosimeter with up to four spectral ranges and 2000 Hz |
| Spectral range | 200–480 nm |
| Measuring range | Irradiance: 0.0001–25000 mW/cm²; dose: 0.0001 mJ/cm²–6 MJ/cm² |
| Calibration uncertainty (typ.) | 4.5–6.0 % (k = 2) |
| Output / interface | PC interface: USB |
| Time resolution | Sampling rate: 1 Hz–2000 Hz, adjustable |
| Calibration | traceable to PTB / NIST; factory calibration, recalibratable |
| Standards / guidelines | no product-specific standard; calibration per DIN EN ISO/IEC 17025:2018 available |
| Suitable for | Additive manufacturing and 3D printing; UV curing and photopolymerisation; UV bonding, potting and encapsulation; Packaging and filling technology |
| Not suitable for | spectrally resolved measurement (peak wavelength, bandwidth); irradiance above 25000 mW/cm² (standard range); sensor temperatures above 70 °C; use under water or under pressure |
| Datasheet revision | Rev. 2026-09-08 (E_curelog.pdf) |
The calibration uncertainty stated above is the expanded uncertainty of the calibration (k = 2, confidence level approx. 95 %) and applies to the calibration source and the calibration conditions. In use the measurement uncertainty is larger: spectral mismatch at the source actually used, the sensor temperature, ageing since calibration as well as distance and alignment to the source are added to it. How these combine into an uncertainty budget is explained under Measurement uncertainty in UV measurement.
For optimal measurement results, we deliver the curelog in four versions:
- The curelog BASE measures one spectral range and shows the peak irradiance and the dose; it does not record.
- The curelog ONE measures one spectral range and records the time-resolved irradiance and the dose.
- The curelog LED is adapted for LED measurements at the wavelengths 365 nm, 385 nm, 395 nm, 405 nm and 450 nm. The curelog LED also records UV radiation.
- The curelog PRO measures and records UVA, UVB, UVC and VISB according to the international CIE classification.
Experience the curelog as an interactive 3D model
Rotate the housing, read the display and try out the recessed button – just like on the real device.
The curelog can be viewed from all sides in the 3D product viewer – true to the original, generated from the CAD design data. A click on the button at the side wakes the display and shows the readings for UVA, UVB, UVC and VIS, just as on the real device.
Technical data curelog dose meter
| Irradiance meas. range | 0,0001–25000 mW/cm² |
| Dose range | 0,0001 mJ/cm² - 6 MJ/cm² |
| Resolution | 0,0001 mWcm² / mJ/cm² |
| Calibration | traceable to PTB / NIST |
| optional ISO 17025 calibration | |
| Sampling rate | 1 Hz to 2000 Hz, adjustable |
| Recording time | 180 h to 5 min, depending |
| on the time resolution | |
| Memory | 64 MBit |
| AD conversion | 24 bit precision ADC |
| Display | graphical, 128 × 64 px |
| Dimensions | 62,5 × 100 × 14 mm |
| Sensor position | backside |
| Weight | ~125 g |
| Cosine correction | yes |
| Operation temperature | 70 °C |
| briefly for up to 60s at | |
| 120 °C ambient temperature | |
| Power supply | internal Li-Ion battery |
| Battery life | 30 h on one battery charge |
| PC interface | USB |
| System requirements | Windows 10 / 11 |
| 30 MB HDD, 4 GB RAM |
Frequently asked questions: curelog
curelog ONE measures one spectral range with time profile, curelog LED is optimised for UV LED lamps from 365 to 450 nm, curelog PRO records four ranges simultaneously: UVA, UVB, UVC and VISB. For a conveyor system with one lamp type ONE is sufficient, for mixed lamps or the comparison of mercury and LED dryers PRO is intended. All versions are 14 mm high and travel with the workpiece through the system.
A workpiece passes a focused UV lamp at 30 m/min in a few hundred milliseconds. Only with a recording rate up to 2000 Hz is the peak irradiance captured and the dose correctly calculated as the integral over the profile; at 10 Hz the peak would be lost and the dose underestimated. The curelog measures 0.0001–25,000 mW/cm² and doses up to 6 MJ/cm² over up to 180 hours.
The curelog stores peak, dose and time profile internally and transfers them via USB to the PC software, which compares profiles and exports them as a report. With the optional docking station curelog DOCK, RS-485 and RS-232 are available to pass readings automatically to a controller or a quality system. Every shift can thus be documented with a reference run, as validations per EU GMP or ISO 9001:2015 require.
The calibration certificate states the expanded calibration uncertainty with k = 2; for the curelog it is typically 4.5–6.0 %. In use the measurement uncertainty is larger, because spectral mismatch at the source actually used, sensor temperature, ageing and measuring geometry are added to it. How these combine into an uncertainty budget is explained under Measurement uncertainty in UV measurement.
On the PC, measurements can be displayed, evaluated, compared and exported. By time synchronisation and comparing the measured data, changes in irradiance can simply be seen. The date and time of each measurement are saved.
Settings:
- Data storage rate & trigger threshold
- Recording time from approx. 5 min to 180 hours
Data export:
- Measurements with irradiance profile & dose
- Measurement parameters, date/time, duration
curelog DOCK - connecting to the machine control
For integration into a machine control we offer the docking station curelog DOCK. It transfers the measurements to the PLC via RS-485 or RS-232. The data is evaluated directly in the PLC, so that a prompt for a detailed data check can also be shown on the HMI. The readings are protected against transmission errors by a CRC-16 checksum.
Example commands:
- CL_MeasResult? - query the measurement result
- CL_SerialNr? - query the serial number
- CL_Firmware? - query the firmware version
- CL_CalibDate? - query the calibration date
Technical data of the curelog DOCK
| Item | Value |
|---|---|
| Operating voltage | 24 V DC |
| Current consumption | below 500 mA |
| Data output | peak irradiance, dose |
| Spectral ranges | 1 to 4, depending on the curelog |
| Connection | Würth Elektronik WR-TBL series 3633 - 3.81 mm |
| Communication | RS-485/RS-232, switchable; USB for firmware updates |
| Transmission parameters | 115200 baud, 8 data bits, 1 stop bit, no parity; RS-485 full duplex |
| Response time, typical | 60 ms |
| Response time, maximum | 200 ms |
| Mounting | bench-top or wall mounting |
| Dimensions | 120 x 80 x 30 mm |
| Weight | about 300 g |
| Operating temperature | 0 to 60 °C |
| Storage temperature | -10 to 60 °C |
| Humidity | 20 to 80 %, non-condensing |
Radiometer vs. spectral radiometer
The curelog is a radiometric measuring device. With this measuring principle the irradiance is recorded for each spectral range by filtering and a photodiode. The filters and photodiodes are robust and the measurements are very well reproducible. However, the filtered radiometers cannot detect changes in the spectrum.
Our spectroradiometer like the UVpad are suitable for this purpose. In the UVpad, the light is spectrally decomposed and measured with 512 photodiodes. Due to the high spectral resolution, measurements of all lamps / LEDs are possible without errors. The curelog is subject to an error called „spectral mismatch“. Please contact us to discuss the calibration of the curelog. The curelogs have the advantage of a larger dynamic range and measure faster.
The comparison should help you to choose the right measuring device.
UVpad and curelog compared
| Feature | UVpad | curelog |
|---|---|---|
| Measurements of different lamps | ideal | possible |
| Number of photodiodes | 512 | up to 4 |
| Irradiance measurement E | yes | yes |
| at medium irradiance (2–5,000 mW/cm²) | yes | yes |
| at high irradiance (25–35,000 mW/cm²) | with HP option | yes |
| at low irradiance (0.1–500 mW/cm²) | with HS option | yes |
| at the lowest irradiance (0.0001–2 mW/cm²) | – | yes |
| Dose measurement D | yes | yes |
| Use on UV conveyor systems | E up to 10 m/min, D up to 100 m/min | up to 100 m/min |
| Recording time | 8 min to 5 s | 180 h to 5 min |
| Sampling rate | 100 Hz to 0.1 Hz | 2000 Hz to 1 Hz |
| Reproducibility | about 3 % | about 1 % |
| Calibration uncertainty, typical | 5.0–9.5 % | 4.5–7 % |
| Dimensions | 160 x 100 x 14.4 mm³ | 62.5 x 100 x 14 mm³ |
| Power supply | 3 x CR2032 | Li-ion battery |
| Remote control from the PC | yes | yes |
| Software for display and analysis | yes | yes |
| Software for time synchronisation of the data | yes | – |
| Firmware upgrades | on recalibration | simply by software |
Order numbers, scope of delivery, accessories and versions
| Version | Order number |
|---|---|
| curelog PRO | 680004 |
Measures UVA, UVB, UVC and VISB according to the international classification - for UV curing.
| Designation | Order number |
|---|---|
| curelog LED | 680002 |
Adapted for LED measurements; measures UVA+ and UVBB - for UV bonding.
| Spectral range | Order number |
|---|---|
| UVC | 680001C |
| UVB | 680001B |
| UVA | 680003A |
| UVA+ | 680003A+ |
| UVBB (broadband) | 680001BB |
| LUX | 680001L |
The curelog ONE measures one spectral range and is therefore the most economical version. Please state the required spectral range with your order.
| Designation | Order number |
|---|---|
| curelog DOCK | 680005 |
Base station for connecting to the PLC. The peak irradiance and the dose are output through RS-485 or RS-232.
| Service | Order number |
|---|---|
| Factory calibration | 710000 |
| ISO 17025 calibration | 17025 |
Accredited calibration to ISO/IEC 17025 in our own calibration laboratory. On delivery the device is already factory-calibrated.
