
138 Transmitter Configuration and Use: Series 1000 and 2000 Transmitters
Troubleshooting continued
4. If you have an integral installation (Model 1700/2700 transmitters only):
a. Loosen the four cap screws that fasten the transmitter to the base (see Figure B-8).
b. Rotate the transmitter counter-clockwise so that the cap screws are in the unlocked
position.
c. Gently lift the transmitter straight up, disengaging it from the base.
Note: You may disconnect the 4-wire cable between the core processor and the transmitter, or leave it
connected.
5. Loosen the captive screw (2.5 mm) in the center of the core processor. Carefully remove the
core processor from the sensor by grasping it and lifting it straight up. Do not twist or rotate
the core processor.
6. Using a digital multimeter (DMM), check the pickoff coil resistances by placing the DMM
leads on the pin pairs. Refer to Figure 10-2 to identify the pins and pin pairs. Record the
values.
Figure 10-2 Sensor pins
CAUTION
If the core processor pins are bent, broken, or
damaged in any way, the core processor will not
operate.
To avoid damage to the core processor pins:
• Do not twist or rotate the core processor when
lifting it.
• When replacing the core processor on the pins, be
sure to align the guide pins and mount the core
processor carefully.
Left pickoff
( + )
Right pickoff
( + )
Drive
( + )
Drive
( – )
Right pickoff
( – )
Left pickoff
( – )
Lead length compensator
(1)
( + )
Resistance temperature detector return /
Lead length compensator
(common)
Resistance temperature detector
( + )
(1) LLC for all sensors except T-Series and CMF400 I.S. For T-Series sensors, functions as
composite RTD. For CMF400 I.S. sensors, functions as fixed resistor.
Komentarze do niniejszej Instrukcji