4. MOUNTING
INSTRUCTION
MANUAL
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
Model 405000
Universal two-wire Transmitter
5. INSTALLATION
• J/K thermocouple or RTD inputs
• Configurable INPUT and RANGE
• 4 - 20mA two-wire output connection
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).
• Eliminates the need for compensation
& extension wire
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.
• ABS plastic rugged construction
1. INTRODUCTION
E) Assure the polarity of the sensor wires and of the signal line and
check that the screws of the terminal block are tight.
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).
CAUTIONS: Avoid loose wires that could
touch the solder jumpers. Replace the
protective cover before closing the
2. SPECIFICATIONS
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.
Input
J , K thermocouples, Pt 100Ω RTD (Section 8)
4-20mA two-wire
Output
Input impedance
Excitation current
Circuit break protect
Power supply
Load capability
1 Mohm
0.23mA
Upscale >30mA
12 to 45VDC (polarity protected)
600 ohms max. at 24V
0.1% full scale
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
Accuracy J or K
thermocouple
Accuracy RTD
Linearity
0.1 to 0.25% full scale
0.06% full scale
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.
Calibration
Zero and Span potentiometer adjustments
± 0.02% / oC
Zero drift
Voltage supply effect
± 0.002% / V
32 to 122oF (0 to 50oC)
Cold junction
compensation
RTD Pt 100 sensors:
Operating temperature
RFI immunity
-4 to 158oF (-20 to 70oC)
CE certified
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.
Housing and rating
Dimensions
ABS plastic with protective cover, Nema 2 (IP-42)
1.7” (43mm) dia., 1” (26mm) high
1.3” (33mm) to 1.9” (49mm)
0.8oz. (25g)
2-wire: Connect RTD to terminals 2 and 3 (short terminals 1 and 3).
THERMOCOUPLE Sensors:
Mounting holes
Weight
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.
3. DESCRIPTION
NOTE: Do not ground the temperature sensor and the power supply.
Ground only one or the other to avoid ground loop errors.
1. Protective Cover
2. Mounting hole
4-20mA Output: Available on terminals 5 (--) and 4 (+).
Status LED: As the input to the transmitter increases so does the
3. Zero/Span
intensity of the red LED.
Potentiometers
Typical Application:
4. Wire connections
5. Range solder bridges
6. Circuit removal screw
Wiring for a typical temperature
transmitter application.
7. LED (increases
intensity as transmitter
output increases)
405000
Ver. 1.2 5/03
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