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Exergen D-Series IR Thermometers
The Only Certified Accurate Surface Temperature Instruments in the World
Download D-Series brochure (PDF format)

D501 and D501-RS
Compare the Exergen Microscanner D-series thermometer with conventional alternatives:
Common Surface
Measurement Factors
D-series IR
Conventional IR "Point and Shoot" guns and probes, including laser aimed units Conventional contact   probes, thermocouples, RTD's, thermistors
1. Pre-set Emissivity errors? no effect very sensitive no effect
2. Emissivity shift errors? no effect very sensitive no effect
3. User adjustment errors? no effect very sensitive no effect
4. Background reflection errors? no effect very sensitive no effect
5. Contact errors? no effect no effect very sensitive
6. Friction heating errors? no effect no effect very sensitive
7. Heat sinking errors? no effect no effect very sensitive
8. Time based errors? no effect no effect very sensitive
The D-Series is an entirely different type of instrument than conventional temperature measuring devices. Designed specifically for the highest possible accuracy, it is the only infrared instrument which can be certified as to NIST-traceable accuracy on real surfaces of unknown emissivity, while completely free of contact errors and heat sinking errors of contact devices.
1. Pre-set Emissivity errors
The true emissivity of a surface is known only approximately. Conventional IR devices without Exergen's Automatic Emissivity Compensation System can only display an approximate temperature over their entire temperature range. The "accuracy" specifications given by most manufacturers are only for a "black body" calibration and do not hold outside laboratory conditions. Black body calibrations do not include emissivity shifts, ambient change effects on the target, and other phenomena that introduce significant errors.
2. Emissivity shift errors
Even if an IR "gun" is set to the correct emissivity to read a surface accurately at a particular temperature, it does not mean that the IR "gun" will read the same target correctly at other temperatures. Emissivity of virtually all surfaces changes with temperature. A common assumption for conventional IR thermometry is that emissivity is constant with changes in target surface temperature. Real materials do not have this characteristic.
3. User Adjustment Errors
A setting of emissivity = 0.9 on an IR "gun" from one manufacturer will not necessarily match that of another IR "gun" manufacturer. There are no standards set in the industry on the precise measurement and meaning of "emissivity".
Also, Quality Assurance programs should not rely upon any instrument that allows users to alter the instrument settings and to let it display whatever the user wishes.
4. Background Reflection Errors
Even if emissivity is constant (see #2), there are still errors induced by changing ambient temperatures. For example, with emissivity = 0.9, ambient reflections account for 10% of the signal that the IR "gun" will see. If ambient changes, the IR "gun" will display a different target temperature, even if the target remains at the same temperature.
5. Contact Errors
Thermocouples, RTDs. thermistors, and other contact devices only measure their own temperature. They do not measure surface temperature. Published "Accuracy" specifications are for the probes only, not the surfaces they must measure. Users must guarantee that the probes are brought the same temperature as the surface. Can you guarantee that your probes are brought to the same temperature as the targets to be measured?
6. Friction heating errors
For moving surfaces, a contact probe is prone to frictional heating. The size of the error is dependent on the roughness of the surface, the speed, the coating on the probe, and so on. It is impossible to control all the variables.
7. Heat sinking errors
For most non-metals, heat sinking errors can be quite large. The heat transfer rate of the metal leads required on "contact probes" conducts heat faster than the target material can replace, resulting in unknown and fairly large errors. In general, the less dense the target material, the larger the heat sinking error with a contact probe.
8. Time based errors
Contact temperature probes are slow. The temperature of a target can change more quickly than most probes, resulting in errors in real time measurement.

CALIBRATION/REPAIR SERVICES: The D is factory calibrated under high quality standards. Because there are no mechanical adjustments, the instrument is able to maintain its calibration through vibration and normal use. No field calibration is necessary. Calibration certificates for ISO requirements are available thorough our calibration service, which provides traceable before and after data with the model and serial # of your unit, and the date of calibration.

We also provide repair services, if the unit is older than 2 years it is not covered under warranty and there is a flat fee for repairs and/or calibration. You must contact Industrial Sales (617.923.9900, ext 6238 or fill out this RMA Request Form before you send it back.
Ship to:
Exergen Corporation
ATTN: RMA # _______
400 Pleasant Street
Watertown, MA 02472 USA
To check the calibration of your unit, follow this Technote: #75 Checking Calibration of IRt/c or D-Series with Boiling Water
Other related Technotes are:
#33 Why the D-Series is Recommended for IRt/c Temperature Control Calibration
#1 Quick Installation Guide: Pre-Calibrated Models
#32 Where is the Emissivity Adjustment?
Pricing Information
To obtain pricing information, please contact your local distributor, or call the factory at (617) 923-9900.  U.S. distributors International distributors 
Factory Experts are always at your service. Contact 617.923.9900, ext 6238 or 6263, Or email us at and an expert will be in touch with you within 1 hour (during factory hours of 8AM - 5PM, US EST).
400 Pleasant St. Watertown, MA 02472
Toll Free : 1-800-422-3006
Phone : 617-923-9900 Fax : 617-923-9911