Time Mark 404 Data Sheet

TIME MARK is a division of

MODEL 404

Liquid Level

Sensor

 Digital display of water depth

 Solid-state outputs

 Four adjustable trip points

 4-20mA output

 Moisture protected circuits

DESCRIPTION

The Model 404 Liquid Level Sensor operates in con­junction with a Model 403 Controller for bubbler-type du­plex pumping systems. The 404 contains an air pressure­to-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 404’s four outputs are designed to replace the

float switch inputs to a Model 403, or to be used with a
Model 448 Output Relay Board. A 4-20mA 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 404-24V 404-115V

Input voltage 20-28VAC 105-130VAC

Input frequency 47-65Hz

Power consumption 2W

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
(fixed condition)

Repeat accuracy
(0-60º C)

Dead band 0.1 foot

Switching outputs 4 open-collector transistors rated for regulated

12VDC, 10mA, maximum. Designed as inputs

for the Model 403 Liquid Level Controller or

Model 448 Output Relay Board

Signal outputs 4-20mA output proportional to 0-34.6 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

± 1%

± 2%

Page 1 of 4 11/2011

© 2011 TIME MARK CORPORATION

TIME MARK is a division of

MODEL 404

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 404.

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 120VAC) to the ter­minals marked for input voltage.

3. Observing polarity, connect the LOW terminals to the
LOW terminals on the 403. For connections to 448,
refer to connection chart on page 4.

4. Repeat step 3 for the LEAD, LAG, and HIGH termi­nals.

5. The terminals marked LIQUID LEVEL are the 4­20mA 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 404. 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.

Page 2 of 4 11/2011

© 2011 TIME MARK CORPORATION