151T

Key Features:

• Microprocessor reduces setup time, improves performance, and performs self-diagnostics.
• Multivariable transmitter accepts a variety of input sensor types to meet most applications and help minimize inventory requirements.
• Multifunction LCD readout displays temperature in °C or °F, a bar graph, the tag name, and diagnostic data.
• Flexible configuration supports setup via a PC with Acromag’s software interface package or by using pushbuttons on the optional LCD display.
• 22-breakpoint linearizer table helps the user define custom output transfer functions.
• Sensor break detection and reporting functions allow users to specify a failsafe output and post a message on the optional LCD display.
• Automatic cold-junction compensation ensures high accuracy over a wide temperature range.
• Isolation between input/output circuits allows the use of grounded or ungrounded sensors.
• Output ranges can be set in engineering units anywhere within the input sensor range. No minimum/maximum span limitation.
• Operating temperature: Electronics: -40 to 85°C (-40 to 185°F), Display: -20 to 70°C (-4 to 158°F)

Product Details

General Input


Digital Input Accuracy
– ±0.05% of equivalent millivolt or ohm reading, or the accuracy shown in range tables, whichever is greater.
Ambient Temperature Effect
– Self-correcting over full operating temperature range for changes up to 20°C/hour. Error is less than half the reference accuracy plus 0.1°C per 28°C change.
Noise Rejection
– Common Mode: Better than 120dB @ 60Hz.
Sensor Break Detection
– Failsafe response configurable for upscale (23mA), downscale (3.6mA), or no circuit response.
Linearization
– TC and RTD linearization to ±0.05°C. Custom software configuration table supports up to 22 breakpoints.
Input Conversion Rate
– 7 conversions per second (150mS), typical. Cold Junction Measurement Accuracy ±0.5°C (±0.9°F).
Input Impedance
– Thermocouple/millivolt input: 0.2M ohm.
– RTD/resistance input: 1M ohm.
RTD Input Configuration
– Supports two, three, and four-wire (Kelvin) RTDs.
RTD Excitation Current
– 0.3mA nominal.

Input Ranges & Accuracy


Universal input with PC or HART configuration
• RTD (2, 3, and 4-wire),
– 100 ohm Pt DIN (alpha = 0.00385),
– 100 ohm Pt SAMA, (alpha = 0.003923)
– 10 ohm Cu, 100 ohm Ni, 120 ohm Ni
• Thermocouple: B, C, E, J, K, L, N, R, S, T, U
• Millivolt (-15 to 115mV)
• 4 to 20mA DC (with optional 5 ohm resistor)
• Resistance (0 to 500 ohms)

Output


Output Range
– 4 to 20mA DC.
Output Accuracy
– ±0.05% of span.
Output Load Compliance
– RLOAD = (VSUPPLY – 12V) / 23mA.
– 500 ohm @ 24V DC supply.
Output Response Time (for input step change)
– 250mS typical to 98% of final output value.
Output Action
– Normal or reverse acting.
Damping
– Adjustable from 0 to 32 seconds.

Environmental


Ambient Temperature Range (Operating)
– Electronics: -40 to 85°C (-40 to 185°F).
– Display: -20 to 70°C (-4 to 158°F).
Relative Humidity
– 5 to 100% non-condensing.
Power Requirements
– 12 to 42V DC @ 25mA.
Isolation
– 250V AC (354V DC) continuous isolation between input and output circuits.
Approvals
– CE marked.
– CSA: Class I; Division 2; Groups A, B, C, D.
– EMI/RFI Susceptibility
– Less than ±0.5% of reading at 10V/m, 20KHz-1GHz.
– Electrical Fast Transient (EFT)
– Complies with EN61000-4-4 Level 3 and EN50082-1.
Surge Withstanding Capability (SWC)
– Complies with EN61000-4-5 Level 3 and EN50082-1.
Electrostatic Discharge (ESD)
– Complies with EN61000-4-2 Level 3 and EN50082-1.
Radiated Emissions
– Meets or exceeds EN50081-1 for Class B equipment.
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