Control unit

Name: Control unit
Brand: WIKA

For pointer instruments with inductive contacts

Output

Relay output

Protection

IP20

CERoHSI (M1) II (1) D II (1) GI (M1) II (1) D II (1)GI(M1)II(1)DII(1)G

Price

On request

Depends on configuration

Request a quote

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Description

The model 904 control unit is used in combination with model 831 inductive contacts. The control unit consists of a power supply unit, a control element, a switching amplifier and a relay output. Certain versions are approved for the operation of inductive contacts in Ex areas.

Special features

Versions for Ex areas available
1 or 2 potential-free change-over contacts
Case for DIN-rail mounting

Identification

Model	904
Subcategory	Control unit

Electrical characteristics

Output signal	Relay output · Relay output (SPDT) · DC 24 V voltage output
Power supply	AC 230 V, -10...+6%; AC 115 V, -10...+6%; AC 24 V, -10...+6%; DC 24 V, -10...+15%
Electrical connection	Screw terminals
Switching function	Change-over contact
Switching contacts	1

Materials

Case material

Polycarbonate (PC), Polyamide 6.6, Polyamide 6.6, red/black

Operating environment

Ambient temperature	+0…+70 °C
IP rating	IP20
Weight	0.24 kg

Certifications and approvals

Certifications	CERoHS
Explosion protection	I (M1) II (1) D II (1) GI(M1)II(1)DII(1)G

Additional details

Datasheet languages

Tables from datasheet

Specifications	Model 904.28 KFU8-SR-Ex1.W	Model 904.29 KFU8-SR-Ex2.W	Model 904.33, safety equipment KFD2-SH-Ex1
Voltage supply	DC 19 ...30V or AC 90 ... 253 V, 50 ... 60 Hz	DC 19 ...30V or AC 90 ... 253 V, 50 ... 60 Hz	DC 20 ...35V
Power consumption	DC: ≤ 1Wor AC:3VA	DC: ≤ 1Wor AC:3VA	2.3VA
Input
Quantity	1	2	1
Open-circuit voltage	DC 8V	DC 8V	DC 8.4V
Short-circuit current	8mA	8mA	11.7mA
Switch point	1.2 mA≤Is ≤ 2.1mA	1.2 mA≤Is ≤ 2.1mA	2.1 mA≤Is ≤ 5.9mA
Switch hysteresis	Approx.0.2mA	Approx.0.2mA	Approx.0.6mA
Control line resistance	100Ω	100Ω	≤ 50Ω
Safety-related characteristic values (Ex)
Max. voltage U 0	DC 10.5V	DC 10.5V	DC 9.56V
Max. current I 0	13mA	13mA	16.8mA
Max. power P 0	34mW	34mW	41mW
Perm. external capacitance	2.41 µF	2.41 µF	650 nF
Perm. external inductance	210mH	210mH	5mH
Ex marking	I (M1) II (1) D II (1)G	I (M1) II (1) D II (1)G	I (M1) II (1) D II (1)G
Output signal
Relay output	1 x SPDT (single pole double throw)	2 x SPDT (single pole double throw)	1 safety-related relay output
Load capacity AC	250 V, 2 A, 500 VA, cos ϕ > 0.75	250 V, 2 A, 500 VA, cos ϕ > 0.75	50 V, 1 A, cos ϕ > 0.7
Load capacity DC	40 V, 2 A; resistive load	40 V, 2 A; resistive load	24 V, 1 A; resistive load
Pick-up delay	Approx. 20 ms	Approx. 20 ms	≤ 1 ms
Drop-out delay	Approx. 20 ms	Approx. 20 ms	≤ 1 ms
Max. switching frequency	10 Hz	10 Hz	5 Hz
Ambient conditions
Operating temperature range	-40 ... 60 °C [-4 ... 140 °F]	-40 ... 60 °C [-4 ... 140 °F]	-20 ... 60 °C [-4 ... 140 °F]
Perm. relative humidity	≤ 95 %, non-condensing	≤ 95 %, non-condensing	≤ 95 %, non-condensing
Ingress protection per IEC/EN 60529	IP20	IP20	IP20
Case
Design	Suitable for DIN rail per EN 60715,TH 35
Material	Polycarbonate (PC)	Polycarbonate (PC)	Polycarbonate (PC)
Dimensions	Form D, see page 7	Form F, see page 7	Form E, see page 7
Weight	Approx. 0.15 kg [0.33 lb]	Approx. 0.15 kg [0.33 lb]	Approx. 0.28 kg [0.62 lb]
Order number	14692440	14692453	2307618

Logo	Description	Region
	EU declaration of conformity	European Union
	EMCdirective
	Low voltage directive
	RoHS directive (only models 904.28, 904.29 and 904.33)

Logo	Description	Region
	EU declaration of conformity ATEX directive Hazardous areas	European Union