Thermocouple Temperature Panel Meter / Controller

High accuracy plus linearized transmitter & control outputs

Load cell meter by TD Micronic

Features

  • Factory calibrated for thermocouple types J, K, T, E, N, R, S
  • Entire range of each thermocouple in one scale
  • Selectable 1° or 0.°1, degrees Celsius, Fahrenheit, Kelvin or Rankin
  • Up to 60 conversions per second, peak or valley display
  • Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power
  • Wide choice of options:
    - 2 or 4 relays, mechanical or solid state (isolated)
    - Analog output, 4-20 mA, 0-10V, or -10V to +10V (isolated)
    - Serial data I/O: Ethernet, USB, RS485, RS232 (isolated)
    - Custom curve linearization, rate from consecutive readings
Description
dc-panel-meter

The thermocouple meter is factory calibrated for type J, K, T, E, N, R and S thermocouples for exceptional accuracy and repeatability. The entire span of each thermocouple type is presented in a single range. The thermocouple type, unit of measure (°C or °F), resolution (1° or 0.1°), and upscale or downscale open sensor indication are selectable from the front panel or via the serial interface. Display in Kelvin or Rankin is selected by offsetting the Celsius or Fahrenheit ranges. Cold junction compensation is standard.

All ranges for all temperature sensor types are digitally calibrated at the factory, with calibration factors stored in an EEPROM on the signal conditioner board. This allows temperatures sensors and signal conditioner boards to be changed in the field without recalibrating the meter.

thermocouple signal conditioner boardHigh read rates at up to 60 or 50 conversions per second while integrating the signal over a full power cycle are provided by Concurrent Slope (US Pat 5,262,780) analog-to-digital conversion. High read rates are ideal for peak or valley capture, real-time computer interface, and control. Peak and valley values are automatically captured. These may be displayed via a front panel pushbutton command or a control signal at the rear connector, or be transmitted as serial data.

Digital filtering is selectable for electrically noisy environments, including a batch averaging filter and an adaptive moving average filter which provides a choice of 8 time constants from 80 ms to 9.6 s. When a significant change in signal level occurs, that filter adapts by briefly switching to the shortest time to follow the change, then reverts back to the selected time constant. In a selectable Auto filter mode, the filter time constant is automatically selected based on detected signal noise.

Designed for system use. Optional plug-in boards for communications and control include Ethernet and other serial communication boards, dual or quad relay boards, and an isolated analog output board. s may be powered from 85-264 Vac Vac or optionally from 12-32 Vac or 10-48 Vdc. The display is available with red or green LEDs. The 1/8 DIN case meets NEMA 4X (IP65) specifications from the front when panel mounted. Any setup functions and front panel keys can be locked out for simplified usage and security. All power and signal connections are via UL / VDE / CSA rated screw clamp plugs.

Specifications

Quick Selection Guide

TC Type Range Conformity Error
J -210°C to +760°C (-347°F to +1400°F) ±0.09°C (±0.16°F)
K -244°C to +1372°C (-408°F to +2501°F) ±0.1°C (±0.17°F)
T 0°C to +400°C (32°F to 752°F)
-257°C to 0°C (-430°F to +32°F)
±0.03°C (±0.05°F)
±0.2°C (±0.36°F)
E -240°C to +1000°C (-400°F to +1830°F) ±0.18°C (±0.32°F)
N -245°C to +1300°C (-410°F to +2370°F) ±0.10°C (±0.17°F)
R -45°C to +1768°C (-49°F to +3214°F) ±0.17°C (±0.31°F)
S -46°C to +1768°C (-51°F to +3214°F) ±0.12°C (±0.22°F)
Accuracy
Calibration NIST Monograph 125 (IPTS-68)
Overall accuracy at 25°C ±0.01% of full span + conformity error
Span tempco ±0.003% of reading/°C
Reference junct. accuracy 0.5°C, 10°C to 40°C
Electrical
Input resistance 1 GΩ
Input current 100 pA
Max lead resistance 1 kΩ max for rated accuracy
Overvoltage protection 125 Vac
NMR at 50/60 Hz 80 dB plus selectable digital filter
CMR, DC-60 Hz 120 dB with 500 ohm imbalance
CMV, DC-60 Hz 250 Vac from power and earth grounds
A-to-D Conversion
Technique Concurrent Slope (Pat 5,262,780)
A-to-D rate 60/s at 60 Hz, 50/s at 50 Hz
Output update 56/s at 60 Hz, 47/s at 50 Hz
Display update 3.5/s at 60 Hz, 3/s at 50 Hz
Display
Readout 5 LED digits, 7-segment, 14.2 mm (.56")
Color Red or green LED
Indicators Minus sign plus 4 red LED lamps for relays
Open sensor indication Flashes full-scale
Power
Voltage, standard 85-264 Vac or 90-300 Vdc
Voltage, optional 12-32 Vac or 10-48 Vdc
Frequency DC or 47-63 Hz
Power  consumption (typ. base meter) 1.2W @ 120Vac, 1.5W @ 240Vac, 1.3W @ 10Vdc, 1.4W @ 20Vdc,
1.55W @ 30Vdc, 1.8W @ 40Vdc, 2.15W @ 48Vdc
Power Isolation 250V rms working, 2.3 kV rms per 1 min test
Analog Output (optional)
Output levels 4-20 mA, 0-20 mA, 0-10V, -10 to +10V (jumper selectable)
Current compliance 2 mA at 10V ( > 5 kΩ load)
Voltage compliance 12V at 20 mA (< 60Ω load)
Scaling Zero and full scale adjustable from -99999 to +99999
Resolution 16 bits (0.0015% of full scale)
Isolation 250V rms working, 2.3 kV rms per 1 min test
Relay Outputs (optional)
Relay types 2 Form C contact relays or 4 Form A contact relays (NO) 2 or 4 Form A, AC/DC solid state relays (NO)
Current tatings 8A at 250 Vac or 24 Vdc for contact relays 120 mA at 140 Vac or 180 Vdc for solid state relays
Output common Isolated commons for dual relays or each pair of quad relays
Isolation 250V rms working, 2.3 kV rms per 1 min tes
Serial Data I/O (optional)
Board selections RS232, RS485 (dual RJ11 or RJ45 connectors), USB, Ethernet, USB-to-RS485 converter, Ethernet-to-RS485 converter
Protocols Modbus RTU, Modbus ASCII, Modbus TCP (Ethernet), TDM ASCII
Data rates 300 to 19200 baud
Digital addresses 247 (Modbus), 31 (TDM ASCII),
Isolation 250V rms working, 2.3 kV rms per 1 min test
Environmental
Operating temperature 0°C to 55°C
Storage temperature. -40°C to 85°C
Relative humidity 95% at 40°C, non-condensing
Protection NEMA-4X (IP-65) when panel mounted
Applications
Linearized 4-20 mA transmitter output of  temperature panel meter

Operation as a 4-20 mA Transmitter

With the optional analog output board, 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  temperature panel meter Combined temperature controller and 4-20 mA transmitter operation of  temperature panel meter

Operation as a Fast Controller

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