++++++ Exergen Corporation ++++++

microIRt/c

The world’s smallest IRt/c’s are self powered, with K t/c output.

For those special applications where mounting is impossible with standard sized sensors, the micro IRt/c can go places no other IR sensors have gone before, with the same high performance as all of the IRt/c products.

Optics available are 1:2 (all temperature ranges available) and 4:1 (only calibrated for K-440F/220C).

There are four models to choose from:

	microIRt/c
	microIRt/c.SV
	microIRt/c.4
	microIRt/c.4SV

NOTE: microIRt/c’s have higher impedance than typical IRt/c’s, Smart transmitters are available to linearize and deal with impedance issues, see: Smart-microIRt/c

OUTLINE DRAWINGS:

	microIRt/c
	microIRt/c.SV
	microIRt/c.4
	microIRt/c.4SV

TEST REPORT FOR THE LINEAR RANGES OF THE micro IRt/c's:

Results from linear tests are displayed here, and this information is useful for the users who are utilizing conventional thermocouple input devices with the micro IRt/c's. With an impedance range of 15 - 40 kohms, we recommend using input devices with less than 1 nanoamps of leakage current to minimize offset errors. For programmable input device users, the linear range can be increased, and the custom tables can be used. The published tables are only good for ambient temperatures close to 25C, if the ambient temperatures change, the accuracy will maintain at temperatures close to the calibration point. Outside that range the accuracy will not hold, and custom tables can be generated for varying ambient temperatures upon request (contact industrial@exergen.com for more info).

TIPS FOR CHECKING YOUR INPUT DEVICE FOR USE WITH THE HIGH IMPEDANCE µIRt/c:

Simply place a 40 kohm resistor across the + and - of the t/c input leads, of your input device. If the device reads close to the correct ambient temperature, it is good. If it reads higher than the correct ambient try to correct for it via an OFFSET. If you can, then it's OK for use. If you can't then the device is not compatible. If it reads open circuit or sensor break, then the device can not be used, unless you can disable the sensor break detection. The Smart-microIRt/c is a good alternate if the microIRt/c has impedance/leakage current issues.

FOR OEM'S AND DESIGNERS:

Since the µIRt/c has high impedance, schematics are available to transform the impedance from high to low.

MV OUTPUT TABLES:

To expand the linearization of the uIRt/c over a wider temperature range, use these tables with your programmable input devices. MV OUTPUT TABLE FOR microIRt/c.4-K-440F/220C.

ACCESSORIES:

Air purge jacket (APJ-1) for cleaning and cooling to 347 F (175 C), and inexpensive mounting accessories for micro IRt/c and APJ-1 are here.
APJ-1 air purge jacket assembly drawing with recommended fittings and tubings.

EUROTHERM CONTROLS ADDS SPECIAL CONTROLLERS FOR HIGH IMPEDANCE µIRt/c TO THEIR PRODUCT LINE:

The 2132 and 2116 controllers can be ordered with the sensor break detection removed - The specials number is 'EU0533'. This must entered at the end of the hardware ordering code (i.e. order as (2132 or 2116)/CC/(VH or VL)/ENG/OP1 code/OP2 code/EU0533.). For pricing info contact Eurotherm at: (703) 443-0000 or via their website:
http://www.eurotherm.com/wrldwide.htm, also see 2132/2116 Manual Supplement

LINEARIZATION FILES FOR EUROTHERM CONTROLLERS:

For the users with itools and Series 2000 configuration stations, you can easily download the custom curve for these sensors. The file will be identified to be viewed as a parameter on the controller by U***, where the *** will be the calibration temperature (for example µIRt/c-K-180F/90C is U180).

For up-to-date Linearization files, please email your request to industrial@exergen.com.

Grounding and Shielding for Electrostatic Protection and Noise Suppression. For all microIRt/c's with shielded cable, follow Technote # 82.

microIRt/c response time curve.

Pricing Information

To obtain pricing information, please contact your local distributor, or call the factory at (617) 923-9900.

U.S. distributors | Foreign distributors

email: industrial@exergen.com