Delta Faucet DF-745 Manuel D’Utilisation

Connecting to External Devices                                        DF-745

The 4-20 mA analog output correlating to the front panel display reading is provided on the 
rear of the analyzer through connector J4. This output is electrically isolated from all other 
analyzer outputs, and from chassis (Earth) ground.

The maximum load resistance for each is 1K Ohms and the analyzer provides a compliance 
voltage of approximately 28 VDC.

Four form C (SPDT) relays (contact closures) are provided to assign to the various alarms.  
The contacts are rated at 30 VDC, 1A. They are not designed to switch AC power.

The relay contacts can be programmed through the user interface for up to four moisture 
levels, temperature, moisture cell diagnostics, zero calibration in progress, analyzer off line, 
freeze of analog outputs during calibration.

The relays are wired for Fail Safe operation such that a Normally Open (No alarm) contact 
connects to common when an alarm occurs or when power to the instrument is lost.

The relay wiring can be tested with the Relay test routine found on page 57.

Pin #

Moisture Relay

Description

J8-8

GND

Ground

J8-7

RLY2-NC

Relay 2 Normally Closed

J8-6

RLY2-NO

Relay 2 Normally Open

J8-5

RLY2-COM

Relay 2 Common

J8-4

RLY1-NC

Relay 1 Normally Closed

J8-3

RLY1-NO

Relay 1 Normally Open

J8-2

RLY1-COM

Relay 1 Common

J8-1

KEY

Unused

J9-8

GND

Ground

J9-7

RLY4-NC

Relay 4 Normally Closed

J9-6

RLY4-NO

Relay 4 Normally Open

J9-5

RLY4- COM

Relay 4 Common

J9-4

RLY3-NC

Relay 3 Normally Closed

J9-3

RLY3-NO

Relay 3 Normally Open

J9-2

Key

Unused

J9-1

RLY3-COM

Relay 3 Common

Table 5: Pin-Out of Relay Connectors J8 and J9