Badger Meter ER-420-AC, ER-420-DC, ER-420-LP Data sheet

Industrial Registers

Models ER-420-AC, ER-420-DC & ER-420-LP
Totalizer and Rate of Flow Indicator with 4-20 mA Output Signal

DESCRIPTION

The Badger Meter® Model ER-420 series digital register is especially
designed for computing and displaying total and rate of flow
in fluid flow applications. The units are suitable to handle any
volumetric flow meter with a pulse output.

OPERATION

Model ER-420 is fully menu-driven with understandable text. This
register continues counting during programming.

The analog output with 10 bits resolution has programmable set
points proportional to the flow rate for both 4 mA and 20 mA
output.

A scaled pulse mirroring the count on the display is generated
for use by external instruments. The maximum frequency
is 20 Hz while the pulse width can be adjusted to suit both
electromechanical and electronic counters.

OPERATOR FUNCTIONS

The operator has three functions available:

• TOTAL and flow rate are displayed.

• TOTAL can be reset by pressing CLEAR key twice.

• After pressing SELECT, accumulated TOTAL will be displayed
(cannot be reset).

FEATURES

• Instantaneously displays rate of flow, total and
accumulated total

• Scalable 4…20 mA analog output proportional to rate of flow

• Scalable pulse output

• Available in Loop Powered, AC or DC powered versions

REG-DS-00743-EN-09 (December 2015)

Product Data Sheet

Industrial Registers, Models ER-420-AC, ER-420-DC & ER-420-LP

SPECIFICATIONS

Display

Type High intensity reflective numeric and alphanumeric LCD, UV-resistant

Digits Seven 17 mm (0.67 in.) and eleven 8 mm (0.31 in.). Various symbols and measuring units

Refresh rate User definable: 8 to 30/sec

Enclosures

General Control Keys GRP (glassfiber-reinforced polyamide) enclosure with polycarbonate window, silicone and

EPDM gaskets
UV-stabilized and flame retardant material
Three industrial micro-switch keys. UV-stabilized silicone keypad

Field/wall-mount enclosures
Classification Drilling

Operating Temperature

Operational –30…80° C (–22…178° F)

Power Supply

ER-420-DC 24V AC / DC + 10%. Power consumption maximum is 0.5 Watt

ER-420-AC 115…230V AC + 10%. Power consumption maximum is 0.5 Watt

ER-420-LP Output loop powered: 8…30V DC. Power consumption maximum is 0.5 Watt

Models DC/AC The total consumption of the sensors, backlight and outputs may not exceed 400 mA @ 24V

Sensor Excitation

Dimensions: 130 x 120 x 75 mm (5.10 in. x 4.72 in. x 2.95 in.) LxHxD. IP67 / NEMA4X
Three 3/4 in. holes

ER-420-LP 3.2V DC for pulse signals.

OTE:N This is not a real sensor supply. It is suitable only for pulse sensors—like reed switches—with

a very low power consumption.

ER-420 AC/DC 3.2, 8.2, 12 and 24V DC. Maximum is 400 mA @ 24V DC

Terminal Connections

Type Removable plug-in terminal strip. Wire maximum is 1.5 mm2 and 2.5 mm

Data Protection

Type EEPROM backup of all settings, backup of running totals every minute

Data retention is at least 10 years

Passcode Configuration settings can be passcode protected

Environment

Electromagnetic compatibility Compliant ref: EN 61326 (1997), EN 61010-1 (1993)

Inputs

Flowmeter

Type P NPN/PNP, open collector, reed switch, active pulse signals 8…12 and 24V

Frequency Minimum 0 Hz, maximum 7 kHz for total and flow rate

Maximum frequency depends on signal type and internal low-pass filter
Example: Reed switch with low-pass filter: maximum frequency is 120 Hz

K-Factor 0.000010…9,999,999 with variable decimal position

Low-pass filter Available for all pulse signals

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Page 2 December 2015