The DRI-U Series is a DIN rail mount,
thermocouple, RTD, resistance or voltage
input signal conditioner with 1800V isolation
between input, output and power. The field
configurable input and output offers flexible,
wide ranging capability for most temperature
signal conditioning applications. The DRI-U Series
is configured via DIP switch for Types J, K, T, E, R,
S, B, N, or C thermocouples or Pt, Ni or Cu RTDs.
Additionally, functions such as signal linearization, up or
down-scale burnout, number of RTD leads (2, 3 or 4) and
voltage or current output are also set via dip-switches.
Cold-junction compensation for accuracy and performance
Accuracy and performance during warm-up and during
changes in ambient temperature are maximized.
The cold-junction compensation technique utilizes
two temperature sensors to measure the differential
temperature near the terminal block. Using heat transfer
calculations with the measured differential temperature
and the known thermal conductivity of the PCB, the
terminal junction temperature is determined with extreme
accuracy. Even during unstable thermal states such as
start-up, ambient temperature changes or changing load
or power, the DRI-U Series performs extremely accurate
thermocouple temperature measurement.
Quick and accurate calibration checks
System performance and productivity are improved
due to reduced warm up time, fewer temperature
measurement errors and tighter process control for
higher quality. Most significantly, it allows calibration to
be checked quickly and accurately without the effects
of rapid ambient temperature changes due to opening
a control panel door, which often causes erroneous
readings and miscalibrations that are a common cause
of measurement errors.
Easy field ranging for any thermocouple or RTD input types
Touch calibration technology allows easy field ranging
for any of the thermocouple or RTD input types. For
example, the dip-switch configured range for the J Type
thermocouple is -210 to 760°C (-346 to 1400°F). Using a
thermocouple simulator as a reference, the DRI-U Series
could be ranged for 0 to 50°C (32 to 122°F) or
0 to 500°C (32 to 932°F) by simply applying the desired
minimum and maximum input levels and pushing the
range button to store the levels in non-volatile memory.
The output is ranged by applying an input signal to
achieve an accurate output level and pushing the range
button.
The DRI-U Series field configurable thermocouple or
RTD input signal conditioner is useful in eliminating
ground loops and interfacing temperature sensors
to data acquisition and control systems. Three-way
isolation completely eliminates ground loops from any
source. Isolation protects expensive SCADA systems
from ground faults and allows the noise reduction
benefits of grounded thermocouples or sensors to be
realized.
The DRI-U Series employs the latest analog to digital
signal processing technology and advanced low-power
microprocessors. Cold junction compensation (CJC)
of thermocouples, and lead length compensation for
RTDs ensures an extremely accurate and stable signal
for virtually any temperature sensor to DC signal
conversion.
High density DIN rail mounting offers a very compact
solution and saves valuable panel space. Power is
delivered to the DRI-U Series using the exclusive
ACPB (AC power) or DCPB (DC power) rail which
reduces wiring requirements and the need to daisychain
power. Plug-in screw terminals ensure easy
installation and low Mean-Time-To-Repair (MTTR).
The DRI-U Series is equipped with front panel LEDs
for input power (green-on), input overrange and
underrange; input open circuit (yellow-on); and switch
setting error (red-on).
The DRI-U Series can be configured via dip-switches
for a wide variety of temperature input ranges for RTD,
thermocouple, resistance and voltage inputs. Inputs
can be offset by >90% or adjusted down to <10% of
the full scale span.
The factory default configuration for the DRI-U Series is as follows:
Input Type: Thermocouple, Type J Input Range: 0 to 500°C (32 to 932°F) Burnout: Upscale Output Range: 4 to 20 mA
Specifications INPUT
Input Types and Ranges: See tables Impedance: ≥1.0 MΩ typical for thermocouple and voltage inputs RTD Excitation: ≤ 0.3 mA Burnout Detection: Upscale or downscale CJC Error: ≤±0.1°C max (the output is ensured to be within ±0.5°C of rated accuracy 30 seconds after powering)
OUTPUT
Voltage: Range: DRI-U-AC; 0 to 10V: DRI-U-DC; 0 to 5V or 2 to 10V Drive: 10 mA (1000 Ω load min) Current: Range: DRI-U-AC: 0 to 20 mA; DRI-U-DC; 0 to 20 mA,
4 to 20 mA Drive: 15V (750 Ω max) Isolation: 1800 Vdc or peak AC between input, output and power Configuration: Range: SW1: Pushbutton, input and output ranging Range: SW2: Linearization, burnout, output (voltage or current), and initialization mode Range: SW3: Input type Accuracy: Input A/D: See tables Linearization: ≤±0.05% of accuracy range max Output: ≤±10 mA for current output; ≤±5 mV for voltage output Thermal Stability: CJC: ±0.01°C/°C change in ambient max Zero: ±0.0075% of full scale/°C change in ambient max Span: ±0.0075% of full scale/°C change in ambient max Long Term: ±0.1% max over a 9 month period Response Time: 400 msec, typical Turn On Time: ≤5 seconds to establish output within 99% or 2°C of final value or 0.5°C within 30 seconds LED Indicator: Power (Green): On when power is on, flashes for thermocouple burnout Input (Yellow): Flashes for out of range Red: Flashes for switch setting error Calibration: 1 green, 1 yellow and 1 red LEDs indicate
steps in ranging process Common Mode Rejection: 120 dB at DC, > 90 dB at 60 Hz ESD Susceptibility: Capable of meeting IEC 801-2 level 3 (8 kV) Humidity (Non-Condensing): Operating: 15 to 95% RH @ 45°C (113°F) Soak: 90% RH for 24 Hours @ 60°C (140°F) Temperature: Operating: -25 to 65°C (-13 to 149°F) Storage: -25 to 70°C (-13 to 158°F) Power: DRI-U-AC: 100 to 240 Vac ± 10%, 50 to 400 Hz; 2.5 W max DRI-U-DC: 9 to 30 Vdc ± 10%; 2.5 W max Wire Terminal: Socketed screw terminals for 12 to 22 AWG Weight: 227 g (0.50 lb)
注: An ACPB power rail is required to power the DRI-U-AC modules and is ordered separately. Ordering Example: (1) ACPB-2 AC power distribution bus for 2 modules, ¥10,945
