Extech Instruments VFL Series Instruction Manual

48VFL & 96VFL v1.2 07/13
Symptom Probable Solution
- Sensor break error
- Sensor not connected
- Replace sensor
- Check that the sensor is connected correctly
- A/D converter damage
- Unit must be repaired or replaced
- Check for outside source of damage such as
transient voltage spikes
- Auto tune time out error Set Pb, ti, td manually
Keypad not
functioning
- Keypad is locked
- Keypad is defective
- Set”
”to an appropriate value
- Have unit repaired
Process
value
unstable
- Improper setting of Pb, Ti, Td and
CT
- Start AT process to set Pb, Ti, Td automatically
- Set Pb, Ti, Td manually
No heat or
output
- No heater power or fuse open
- Output device defective or
incorrect output used
- Check output wiring and fuse
- Replace output device
LEDs and
display not
lighting up
- No power to controller
- SMPS failure
- Check power lines connection
- Replace or repair meter
Process
Value
changed
abnormally
- Electromagnetic Interference
(EMI) or Radio Frequency
Interference (RFI)
- Suppress arcing contacts in system to eliminate high
voltage spike sources. Separate the sensors and the
controller wiring from “noisy” power lines. Ground
heaters
Entered
data lost
- EEPROM error - Replace or repair meter
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Extech Instruments VFL Series Specifications

General

Brand	Extech Instruments
Model	VFL Series
Category	Controller
Language	English