Hach NA5600 sc Instalación página 22

Refer to Connect to an external device
relay. Refer to the Operations manual to configure the relay.
The relay terminals accept 1.0 to 1.29 mm
7
application) . Wire gauge less than 18 AWG is not recommended. Use wire with an insulation rating
of 300 VAC or higher. Make sure that the field wiring insulation is rated 80 °C (176 °F) minimum.
Use the relays at either all high voltage (greater than 30 V-RMS and 42.2 V-PEAK or 60 VDC) or all
low voltage (less than 30 V-RMS and 42.2 V-PEAK, or less than 60 VDC). Do not configure a
combination of both high and low voltage.
Make sure to have a second switch available to remove power from the relays locally if there is an
emergency or for maintenance.
NO
Normally open
3.5.6 Connect to the analog outputs
The analyzer has six isolated 0–20 mA or 4–20 mA analog outputs. The loop maximum resistance is
600 Ω.
Use the analog outputs for analog signaling or to control other external devices. Each analog output
supplies an analog signal (e.g., 4–20 mA) that represents the analyzer reading for a selected
channel.
Refer to Connect to an external device
output. Refer to the Operations manual to configure the analog output.
The analog output terminals accept 0.644 to 1.29 mm
shielded wire for the 4–20 mA output connections. Connect the shield at the recorder end. Use of
non-shielded cable can result in radio frequency emission or susceptibility levels higher than the
allowed levels.
Notes:
• The analog outputs are isolated from the other electronics and isolated from each other.
• The analog outputs are self-powered. Do not connect to a load with voltage that is independently
applied.
• The analog outputs cannot be used to supply power to a 2-wire (loop-powered) transmitter.
3.5.7 Connect to the digital inputs
The analyzer can receive a digital signal or contact closure from an external device that causes the
analyzer to skip a sample channel. For example, a flow meter can send a high digital signal when the
sample flow is low and the analyzer skips the applicable sample channel. The analyzer continues to
skip the applicable sample channel until the digital signal stops.
Note: All of the sample channels cannot be skipped with Digital Inputs 1 to 4. A minimum of one sample channel
must be in use. To stop all of the measurements, use Digital Input 6 (DIG6) to put the analyzer in standby mode.
Refer to Table 9 for the digital input functions. The digital inputs are not programmable.
The digital input terminals accept 0.644 to 1.29 mm
Each digital input can be configured as an isolated TTL type digital input or as a relay/open-collector
type input. Refer to Figure
Refer to Connect to an external device
7 2
1.0 mm (18 AWG) stranded wire is recommended.
8
0.644 to 0.812 mm
9
0.644 to 0.812 mm
22 English
on page 23 and
2
(18 to 16 AWG) wire (as determined by load
Table 8 Wiring information—relays
on page 23 to connect an external device to an analog
8. By default, the jumpers are set for isolated TTL type digital input.
on page 23 to connect an external device to a digital input.
2
(24 to 20 AWG) wire is recommended.
2
(24 to 20 AWG) wire is recommended.
Table 8 to connect an external device to a
COM
Common
2
(24 to 16 AWG) wire
2
(24 to 16 AWG) wire
NC
Normally closed
8
. Use twisted pair
9
.