Micron Meters

Micron Digital Panel Meter
Thermocouple Temperature Panel Meter / Controller
High accuracy plus linearized transmitter & control outputs

  • Description
  • Specifications
  • Mechanical
  • Applications
Options
  • Serial communications: Ethernet Interface, Ethernet-to-RS485 server, USB Interface, USB-to-RS485 server, RS485 interface (dual RF11), RS485 Modbus interface (dual RJ45), RS232 interface.
  • Low voltage power: 10-48 Vdc or 12-32 Vac
  • Relay outputs: 2 or 4 relays, contact or solid state
  • Analog output: isolated 4-20 mA, 0-20 mA, 0-10V, 10 to +10V

Description

The Micron 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 secondwhile 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. Microns 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.

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 +3213°F) ±0.12°C (±0.22°F)
Accuracy
Calibration
Overall accuracy at 25°C
Span tempco
Reference junct. accuracy
Span tempco
NIST Monograph 125 (IPTS-68)
±0.01% of full span + conformity error
±0.003% of reading/°C
0.5°C, 10°C to 40°C
±0.003% of reading/°C
Electrical
Input resistance
Input current
Max lead resistance
Overvoltage protection 
NMR at 50/60 Hz
CMR, DC-60 Hz
CMV, DC-60 Hz
1 GΩ
100 pA
1 kΩ max for rated accuracy
125 Vac
80 dB plus selectable digital filter
120 dB with 500 ohm imbalance
250 Vac from power and earth grounds
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
Display
Readout
Color
Indicators
Open sensor indication
5 digits, 7-segment, 14.2 mm (.56")
Red or green LED
Minus sign plus 4 red LED lamps for relays
Flashes full-scale
Power
Voltage, standard
Voltage, optional
Frequency
Power Isolation
85-264 Vac or 90-300 Vdc (DC operation not UL approved)
12-32 Vac or 10-48 Vdc
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test
Analog Output (standard)
Output Levels
Current compliance
Voltage compliance
Scaling
Resolution
Isolation
4-20 mA, 0-20 mA, 0-10V, -10 to +10V (jumper selectable)
2 mA at 10V ( > 5 kΩ load)
12V at 20 mA ( < 600Ω load)
Zero and full scale adjustable from -99999 to +99999
16 bits (0.0015% of full scale)
250V rms working, 2.3 kV rms per 1 min test
Relay Outputs (optional)
Relay Types

Current Ratings

Output common
Isolation
2 Form C contact relays or 4 Form A contact relays (NO)
2 or 4 Form A, AC/DC solid state relays (NO)
8A at 250 Vac or 24 Vdc for contact relays
130 mA at 140 Vac or 180 Vdc for solid state relays
Isolated commons for dual relays or each pair of quad relays
250V rms working, 2.3 kV rms per 1 min test
Serial Data I/O (optional)
Board Selections


Protocols
Data Rates
Digital Addresses
Isolation
Ethernet, Ethernet-to-RS485 server, USB, USB-to-RS485 server, RS485 (dual RJ11), RS485 Modbus (dual RJ45), RS232.
Modbus RTU, Modbus ASCII,Micron ASCII protocol
300 to 19200 baud
247 (Modbus), 31 (Laurel ASCII), 
250V rms working, 2.3 kV rms per 1 min test
Environmental
Operating Temp.
Storage Temp.
Relative Humidity
Protection
0°C to 60°C
-40°C to 85°C
95% at 40°C, non-condensing
NEMA-4X (IP-65) when panel mounted
Key Features
  • Meets 1/8 DIN Standard.
  • Installs from front of panel.
  • Short depth behind the panel: only 4" (102 mm) plus connectors.
  • Understated 0.157" (4 mm) thick bezel.
  • Meets NEMA 4X (IP-65) for high-pressure wawshdon when panel mounted.
  • Screw clamps connectors meet VDE / IEC / UL / CSA safety standards.
  • Rugged GE Lexan® housing material.
  • Safety certified per EN 61010-1.
Dimensions
 

Weight of base meter: 210 g (7.4 oz) typical (DPM, counter, timer, 6-digit remote display)

Weight of option boards: 30 g (1.0 oz) typical per board (analog output, relay output, communications)

Linearized 4-20 mA transmitter output of Laureate temperature panel meter
Operation as a 4-20 mA Transmitter

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