Time Mark 408 Data Sheet
MODEL 408
"
"
"
"
"
"
"
TIME MARK is a division of
Liquid Level
Sensor
Digital display of water depth
Solid-state outputs
Five adjustable trip points
4-20 mA output
Moisture protected circuits
DESCRIPTION
The Model 408 Liquid Level Sensor operates in conjunction
with a Model 407 Controller for bubbler-type triplex pumping
systems. The 408 contains an air pressure-to-voltage transducer
and requires only a small compressor capable of 15 psi (pounds
per square inch) to operate the system down to approximately
35 feet.
The Model 408’s five outputs are designed to replace the float
switch inputs to a Model 407, or to be used with a Model 448
Output Relay Board. A 4-20 mA signal output provides for other
control applications.
A 3-digit LED display continuously shows the liquid level to a
tenth of a foot when the Display Control switch is in the Liquid
Level position. Other settings of the switch allow setting of the
liquid level trip points. LED Indicators illuminate as the levels are
exceeded. A test control allows the trip settings to be checked
without actually raising or lowering the liquid level.
DIMENSIONS
SPECIFICATIONS
MODEL 408-24V 408-115V
Input voltage 20-28 VAC 105-130 VAC
Input frequency 47-65 Hz
Power consumption 2 Watts
Air pressure input 0-15 psi max.
Input air supply fitting Requires 3/16” I.D. tubing
Maximum liquid level
displayed
Calibration accuracy ± 2%
Repeat accuracy ± 1% in fixed condition
Repeat accuracy ± 2% at 32º -140º F
Dead band 0.1 foot
Switching outputs 5 open-collector transistors rated for regulated
12VDC, 10 mA, maximum. Designed as inputs
for the Model 407 Liquid Level Controller or
Model 448 Output Relay Board
Signal outputs 4-20 mA output proportional to 0-40 feet of water
Operating temperature - 20º to +122º F
Storage temperature - 4º to +158º F
Humidity tolerance 0-97% without condensation
Case material 20 gauge Steel
Termination Removable terminal strip
Weight 3.5 lbs
34.6 feet
01/2012 page 1 of 4
© 2012 TIME MARK CORPORATION
MODEL 408
TIME MARK is a division of
Liquid Level Sensor
READ ALL INSTRUCTIONS BEFORE INSTALLING, OPERATING OR SERVICING THIS DEVICE.
KEEP THIS DATA SHEET FOR FUTURE REFERENCE.
POTENTIALLY HAZARDOUS VOLTAGES ARE PRESENT AT THE TERMINALS OF THE MODEL 408.
ALL ELECTRICAL POWER SHOULD BE REMOVED WHEN CONNECTING OR DISCONNECTING WIRING.
DO NOT EXCEED THE OUTPUT OR INPUT RATINGS, AS STATED IN THE SPECIFICATIONS.
PROTECT THE UNIT WITH PROPERLY RATED FUSES.
DO NOT INSTALL IN DAMP OR MOIST AREAS.
THIS DEVICE SHOULD BE INSTALLED AND SERVICED BY QUALIFIED PERSONNEL.
GENERAL SAFETY
Installation Instructions
INSTALLATION
Mount the Sensor in a suitable enclosure. If a Model 448
relay module is being used, mount it in a suitable location near the Sensor.
Referring to the terminal block decal on the sensor and
the illustration on this page, make the following connections
1. Connect a chassis ground to the terminals marked
CHS GND.
2. Connect operating power (24 or 120 VAC) to the
terminals marked for input voltage.
3. Observing polarity, connect the LOW terminals to the
LOW terminals on the 407. For connections to 448,
refer to connection chart on page 4.
4. Repeat step 3 for the LEAD, LAG, LAG-LAG, and
HIGH terminals.
5. The terminals marked LIQUID LEVEL are the 4-20
mA output. If used, connect these terminals to the
appropriate control circuitry. Observe polarity.
Connect a 3/16” I.D. tubing to the air supply fitting on the
back of the 408. Connect the other end of the tubing to
the air compressor and the tank or well .Apply operating
power and proceed to the adjustment procedure.
01/2012 page 2 of 4
© 2012 TIME MARK CORPORATION
Loading...