Manufacturer of Custom Temperature Sensors


Temperature & Pressure Solutions Made Easy
Phone: 800-284-3769 Fax: 858-573-0623
Email: sales@thermx.com

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Contact ThermX Southwest for off the shelf service 858-573-0983.


Thermocouple & RTD Temperature Panel Meters
High accuracy plus linearized transmitter & control outputs

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Features

  • 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.
  • NEMA 4X, 1/8 DIN case.
  • Optional dual relays, 4-20 mA & 0-10 V analog
    output,RS-232/485 I/O, parallel BCD output,
    and low voltage AC or DC power.

Description

temp01.jpg (11987 bytes) Laureate panel 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 meter accepts the outputs of types J, K, T, E, N, R and S thermocouples, plus 100 ohm platinum RTDs with DIN alpha of 0.00385 and 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 Laureate 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.

Plug-in isolated analog output, dual-setpoint controller and RS-232/485 commu- nications or BCD output boards can upgrade the Laureate from stand-alone monitor to system interface and control. The Laureate temperature meter can serve as a highly accurate, isolated, 4-20 mA transmitter.

Laureate panel meters are available with a red or green LED display. Blanking of leading, non-significant zeros simplifies reading. The 1/8 DIN case is water tight to NEMA 4X (IP-65) from the front when mounted in the panel.

Specifications

Thermocouple Input

TC Type

Range

Conformity
Error

J

-210C to +760C
-347F to +1400F

0.09C
0.16F

K

-244C to +1372C
-408F to +2501F

0.1C
0.17F

T

0C to +400C
-257C to 0C
+32F to 752F
-430F to +32F

0.03C
0.2C
0.05F
0.36F

E

-240C to +1000C
-400F to +1830F

0.18C
0.32F

N

-245C to +1300C
-410F to +2370F

0.10C
0.17F

R

-45C to +1768C
-49F to +3214F

0.17C
0.31F

S

-46C to +1768C
-51F to +3213F

0.12C
0.22F

 

  

 

Applicable to all TC types

Calibration
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

DIN
.00385

-202C to +850C
-331F to +1562F

0.03C
0.05F

ANSI
.003925

-202C to +631C
-331F to +1168F

0.04C
0.07F

 

  

 

Applicable to all RTD types

Calibration, DIN
Calibration ANSI

Configuration
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

Display

Readout
Color
Indicators

5 digits, 7-segment, 14.2 mm (.56")
Red or green LED
Minus sign, 2 red LED lamps

A-to-D Conversion

Technique
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

Power

Voltage, std.
Voltage, opt.
Frequency
Power isolation

85-264 Vac and 90-370 Vdc
8-28 Vac and 9-37 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

 

Environmental

Operating Temperature
Storage Temperature
Relative Humidity
Protection

0C to 55C
-40C to 85C
95% at 40C, non-condensing
NEMA-4X (IP-65) when panel mounted

RTD Connections with Excitation & Lead Compensation

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The Laureate 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.

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.

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 it to determine the effect of one lead wire and mathematically subtract the effect of both lead wires.

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Operation as a 4-20 mA Transmitter

With the optional analog output board, Laureate 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.

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Operation as a Fast Controller

With the optional dual contact relay or dual solid state relay output board options, Laureate 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, Laureate 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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