405000 Datasheet, PDF (1/2 Pages) Extech Instruments Corporation. – Universal two-wire Transmitter

INSTRUCTION
MANUAL
Model 405000
Universal two-wire Transmitter
• J/K thermocouple or RTD inputs
• Configurable INPUT and RANGE
• 4 - 20mA two-wire output connection
• Eliminates the need for compensation
& extension wire
• ABS plastic rugged construction
1. INTRODUCTION
Congratulations on your purchase of Extech’s 405000 Universal Two-
wire Transmitter. This professional device, with proper care, will provide
years of safe reliable service. The Model 405000 is a configurable 2-wire
4-20 mA output temperature transmitter for mounting in thermocouple or
RTD connection heads or on its own (indoor use only).
2. SPECIFICATIONS
Input
J , K thermocouples, Pt 100Ω RTD (Section 8)
Output
Input impedance
4-20mA two-wire
1 Mohm
Excitation current
0.23mA
Circuit break protect
Upscale >30mA
Power supply
12 to 45VDC (polarity protected)
Load capability
Accuracy J or K
thermocouple
600 ohms max. at 24V
0.1% full scale
Accuracy RTD
0.1 to 0.25% full scale
Linearity
0.06% full scale
Calibration
Zero drift
Zero and Span potentiometer adjustments
± 0.02% / ^oC
Voltage supply effect
Cold junction
compensation
Operating temperature
± 0.002% / V
32 to 122^oF (0 to 50^oC)
-4 to 158^oF (-20 to 70^oC)
RFI immunity
CE certified
Housing and rating
ABS plastic with protective cover, Nema 2 (IP-42)
Dimensions
Mounting holes
1.7” (43mm) dia., 1” (26mm) high
1.3” (33mm) to 1.9” (49mm)
Weight
0.8oz. (25g)
3. DESCRIPTION
1. Protective Cover
2. Mounting hole
3. Zero/Span
Potentiometers
4. Wire connections
5. Range solder bridges
6. Circuit removal screw
7. LED (increases
intensity as transmitter
output increases)
4. MOUNTING
The 405000 can be mounted in
connection heads with a distance
between holes of 1.30 to 1.81 in.
(33 mm to 46 mm.) #6 (M4)
screws with a maximum head
diameter of 0.27 in (6.8 mm)
should be used
5. INSTALLATION
A) Check that the temperature probe’s measurement range matches the
range for which the 405000 is configured. To reconfigure see
Sections 7 and 8.
B) The mounting head must have a distance of 1.30 in (33 mm.) min.
between holes. The internal diameter of the housing must be at least
1.69 in (43 mm).
C) For heads with 1.69 in. (43 mm) diameter housings, cut the screw
slots. For bigger heads, cutting is not necessary. (Fig. 3).
D) Mount the 405000 so that the wires easily fit through the base and so
that the signal cable can fit through the opening between the lid and
the body.
E) Assure the polarity of the sensor wires and of the signal line and
check that the screws of the terminal block are tight.
CAUTIONS: Avoid loose wires that could
touch the solder jumpers. Replace the
protective cover before closing the
connection head. Avoid corrosive steam,
leaks or direct moisture, use at least IP-54
heads (NEMA 3). Avoid temperatures over
125 °F (50 °C). Avoid vibrations and protect
from electro-magnetic radiation, radio
frequencies, microwaves, high voltage, etc.
6. WIRING
VERY IMPORTANT: Check that the
temperature probe’s measurement
range matches the range for which
the 405000 is configured. In the
event that reconfiguration is
necessary see Sections 7 and 8.
Open the 405000 by removing the lid
(Fig. 4) to access the terminal block.
Refer to Fig. 5 and the text below for
terminal connection information.
RTD Pt 100 sensors:
3-wire: Connect RTD to terminals 1, 2 and 3 (RTD common wires
connect to 1 and 3))
4-wire: Leave one wire unconnected and connect as a 3-wire sensor
described above.
2-wire: Connect RTD to terminals 2 and 3 (short terminals 1 and 3).
THERMOCOUPLE Sensors:
Connect thermocouples to terminal 1 (-) and terminal 2 (+)
IMPORTANT: Connect the thermocouple wire directly to the 405000
terminals or use thermocouple extension wire for the given type of
thermocouple if necessary.
NOTE: Do not ground the temperature sensor and the power supply.
Ground only one or the other to avoid ground loop errors.
4-20mA Output: Available on terminals 5 (--) and 4 (+).
Status LED: As the input to the transmitter increases so does the
intensity of the red LED.
Typical Application:
Wiring for a typical temperature
transmitter application.
405000 Ver. 1.2 5/03