Model 904 Control unit For use with inductive contact devices
09 April 2024
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Model 904
Control unit
For use with inductive contact devices
Application
Measuring instruments with WIKA inductive contact devices may be used in operation rooms subject to explosion hazards in danger areas of Zone 1 and Zone 2. Provided they are supplied from a suitable and certified control circuit (e.g. WIKA control device of type 904.15).
Besides the Ex areas WIKA inductive contact devices are primarily used where it is crucial to obtain especially safe contact with high switching frequency. Since the contacts function in liquid filling, they can be used even under very specific operating conditions. Some typical application fields are chemistry, petrochemistry and nuclear facilities.
Special features
- 904.28 for 1 inductive contact, output: 1 x SPDT
- 904.29 for 2 inductive contacts, output: 2 x SPDT
- 904.30 for 1 inductive contact, safety equipment (SN or S1N), output:1 x fail-safe relay output; 1 x
serially switched output; 1 x passive electronic output
- type of protection: EEx-ia IIc
- electrical ratings: AC 250 V / 2 A / 500 VA (1 A for typ 904.30)
- on delay and drop out delay: 20 ms
- ambient temperature: -20.. +60 °C
- ingress protection IP 20
- control units with DC 20.. 30 V power supply
Model 904.31 - 1 relay output
Model 904.32 - 2 relay output
Model 904.33 - 1 fail-safe relay output
