Electro-Numerics, Inc.
42213 Sarah Way, Temecula, CA 92590, USA


Tel: 800-854-8530 (USA)
Tel: 951-699-2437 
Fax: 951-695-7246


    Micro Series Thermocouple & RTD
Temperature Panel Meters

High accuracy plus linearized transmitter & control outputs


  • Available in three digit heights: 0.56" for panel mounting, 1.0" (Mighty-1) or 5.0" (Mighty-5) for long-distance viewing.
  • Input for thermocouple types J, K, T, E, N, R, S.
  • Input for 100 ohm platinum RTDs with DIN and ANSI curves.
  • High accuracy & repeatability.
  • Celsius, Fahrenheit, Kelvin or Rankine scales.
  • Selectable 1 or 0.1 resolution.
  • 2, 3 or 4-wire RTD connection with lead resistance compensation.
  • Upscale or downscale open sensor indication.
  • Up to 60 conversions per second.
  • Peak value display.
  • AC or DC powered.
  • Green or red display.
  • Choice of isolated plug-in options for control and computer interface:
    dual relays, 4-20 mA & 0-10 V analog output, RS232/485 serial I/O, low voltage AC & DC power.
  • 1/8 DIN case environmentally sealed to NEMA-4X from front panel.
  • 1/8 DIN version certified to UL 3101-1, CAN/CSA-C22.2, EN 61010-1 (CE Mark).


Signal conditioner for Laureate Thermocouple & RTD Temperature MeterMicro Series meters with the temperature signal conditioner board provide highly accurate, stable and repeatable temperature indication for multiple thermocouple types and 100 Ohm platinum RTDs. The meters accept type J, K, T, E, N, R and S thermocouples plus 100 ohm platinum RTD’s with DIN alpha of 0.00385 or ANSI alpha of 0.003925. The thermocouple or RTD type, range and resolution (1 or 0.1) are selectable from the front panel or via the serial interface. Display in Kelvin or Rankine can be selected by offsetting the Celsius or Fahrenheit range.

Cold junction compensation automatically corrects for temperature variations at the thermocouple reference junction at the meter. Open sensor indication is standard and may be set up to indicate either upscale or downscale. RTD excitation is provided by the meter. RTD connections can be of the 2-, 3- or 4-wire type. For 3- and 4-wire connections, the meter automatically compensates for lead resistance of the sensor.

All ranges for all temperature sensor types are digitally calibrated at the factory. This eliminates the need for field calibration or drift caused by potentiometers found in non-microcomputer based meters.

All Micro Ssries meters allow exceptionally fast read rates. Concurrent Slope (Pat 5,262,780) is a method of analog-to-digital conversion that allows up to 60 conversions per second while integrating the input over a full power cycle. Fast read rates provide true readings and fast response for control applications. Display of peak value is standard.

Built-in Flexibility

Plug-in isolated analog output, dual-setpoint controller, RS232/485 serial communications boards can upgrade Micro and Mighty Series meters from stand-alone monitor to system interface and control. A Micro Series temperature meter can serve as a linearized, scalable, ighly accurate, isolated, 4-20 mA transmitter.

Micro Series meters can be powered from 95-240 Vac 10% and 95-370 Vdc, or optionally from 12-34 Vac and 10-48 Vdc. Any setup functions and front panel keys may be locked out for simplified usage and security. The popular 1/8 DIN version with 0.56" high digits is environmentally sealed to NEMA-4X (IP65) from the front when panel mounted, and is available with red or green LEDs.


Thermocouple Input
TC Type Range Conformity Error
J -210C to +760C
-347F to +1400F
K -244C to +1372C
-408F to +2501F
T 0C to +400C
-257C to 0C
+32F to 752F
-430F to +32F
E -240C to +1000C
-400F to +1830F
N -245C to +1300C
-410F to +2370F
R -45C to +1768C
-49F to +3214F
S -46C to +1768C
-51F to +3213F

Applicable to all TC types

Input resistance
Input current
Max lead resistance
Span tempco
Reference junction tempco
Span tempco
Overvoltage protection

NMR at 50/60 Hz
CMR, DC-60 Hz
CMV, DC-60 Hz
Open sensor indication

NIST Monograph 125 (IPTS-68)
1 Gohm
100 pA
1 Gohm max for rated accuracy
0.003% of reading/C
0.02 deg/deg
0.003% of reading/C
125 Vac
80 dB plus selectable digital filter from 80 ms
to 9.6 s time constant
120 dB with 500 W imbalance
250 Vac from power and earth grounds
Flashes full-scale

Pt 100 RTD Input

RTD Alpha Range Conformity Error
-202C to +850C
-331F to +1562F
-202C to +631C
-331F to +1168F

Applicable to all RTD types

Calibration, DIN
Calibration ANSI

Excitation current
Span tempco
Zero tempco
Sensor lead resistance
   tempco per conductor
Overvoltage protection
Open sensor indication
IEC 751 (IPTS-68)
NIST Monograph 126
2, 3 or 4-wire connection
0.2 mA
0.003% of reading/C
0.03 deg/deg
2-wire, 10 mdeg/W/deg up to 10 W
3 & 4-wire, 10 mdeg/W/deg up to 100 W
125 Vac
Flashes full-scale

Thermocouple & RTD

Digit Height
5 digits, 7-segment
Available with 0.56", 1.0", 4.0" or 5.0" digits.
High brightness red. Green available with 0.56" digits.
Minus sign, 2 red LED lamps
A-to-D Conversion
A-to-D Rate
Output Update
Display Update
Concurrent Slope(Pat 5,262,780)
60/s at 60 Hz, 50/s at 50 Hz
56/s at 60 Hz, 47/s at 50 Hz
3.5/s at 60 Hz, 3/s at 50 Hz
Voltage, std.
Voltage, opt.
Power isolation
95-240 Vac 10% and 95-370 Vdc
12-34 Vac and 10-48 Vdc
DC or 49-440 Hz
Safety-rated to 250 Vac, meter ground to earth ground,
DC to 60 Hz, 4.2 kVp per High Voltage Test
Operating Temperature
Storage Temp.
Relative Humidity
0C to 60C
-40C to 85C
95% at 40C, non-condensing
NEMA-4X (IP-65) when panel mounted

RTD Connections with Excitation & Lead Compensation

The Micro temperature meter allows 2-, 3- and 4-wire RTD hookup to the J5 connector. The meter applies an excitation current of 0.2 mA, which it monitors to make ratiometric corrections for excitation supply variations.

2-wire RTD connection to Laureate temperature panel meter

In 2-wire hookup, the meter senses the voltage drop across the 100 ohm RTD and both lead wires. The effect of the lead wires can be measured and subtracted by shorting out the RTD during meter setup.

3-wire RTD connection to Laureate temperature panel meter

In 3- and 4-wire hookup, the meter senses the voltage drop across the 100 ohm RTD and both lead wires as well as the voltage drop across the RTD and one lead wire. This allows the meter to determine the effect of one lead wire and mathematically subtract the effect of both lead wires.

4-wire RTD connection to Laureate temperature panel meter

Sample Applications

Linearized 4-20 mA transmitter output of Laureate temperature panel meter

Operation as a 4-20 mA Transmitter

With the optional analog output board, Micro Series temperature meters can serve as superb, isolated 4-20 mA transmitters. The analog output is scaled to the display, which is linearized to C or F and is exceptionally accurate. The analog output further tracks the high read rate of the meter, at up to 60 readings per second at 60 Hz power. Fast update rates are beneficial in many closed-loop and PID control applications.

Temperature controller operation of Laureate temperature panel meter Combined temperature controller and 4-20 mA transmitter operation of Laureate temperature panel meter

Operation as a Fast Controller

With the optional dual contact relay or dual solid state relay output board options, Micro Series temperature meters can serve as extremely fast and accurate ON/OFF controllers for closed-loop temperature control.

Multiple setpoint operating modes are individually selectable for each relay, as explained in the dual-setpoint controller section. Relay duty cycles and chatter can be minimized with programmable hysteresis and time delays. High duty cycles and extremely fast response times are possible with the solid state relay, which has a typical response time of only 17 ms.

Operation as a Supervisory Monitor

By using the optional dual contact relay or dual solid state relay output options, Micro Series temperature meters can monitor processes and provide alarms or shutoffs when these processes exceed normal limits.

A band deviation operating mode can be selected for each relay, where an alarm is generated whenever the reading is a selected number of counts above or below the setpoint. Relay operation can be selected as latching or non-latching. When an alarm or shutdown condition is reached, a latched output will remain in the alarm condition until it is reset by a front panel pushbutton, via the serial interface, or via the rear connector.

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Electro-Numerics, Inc., 42213 Sarah Way, Temecula, CA 92590, USA
Tel: 800-854-8530 (USA), 951-699-2437;  Fax: 951-695-7246;  sales@electronumerics.com