 |  |
EGE Flow Sensors
Amplifier · Series 400 |
|
Amplifiers for use with equipment
in hazardous areas
|
 |
These amplifiers are designed for fitting
onto standard DIN rails. They feature an LED line
to give a visual indication of flow rates and for ease of setting. The red
LED indicates that
the flow relay is not activated. A yellow LED indicates that flow has just
exceeded the set
threshold value and the flow relay is activated. Four green LED's indicate
that flow has
exceeded the set threshold value by between 30 and 100% and the flow relay
is activated.
An additional output indicating temperature can be set by potentiometer.
When the pre-set
temperature is exceeded, the relay is activated and a red LED is displayed.
A time delay
function is also standard on these units which is adjustable between 0 and
25 seconds. The
slimline version is for DC operation. This device does not have the temperature
or time
delay functions. It offers the user a lower cost alternative when only a
flow out-put is
required, or when space in the panel is limited.
| TYPE | DESIGN |
| SZA 400 Ex-230 | 230 V AC |
| SZA 400 Ex-115 | 115 V AC |
| SZA 400 Ex-24 | 24 V DC |
Monitoring and additional functions
- Flow-monitoring
- Cable monitoring
- Time delay
Note
The amplifier SZA Ex... can operate
with sensors of the series 400 which are allowed for Zone 1 (ST...) or Zone 2
(STS.../STEX). The amplifiers have to be mounted outside the hazardous area. The
amplifiers have in addition to the standard functions a complete cable-break and
short circuit monitoring. Failures are by falling the relay as well as visually
through the red LED shown.
| Technical Data | |||
| Supply Voltage | SZA 400... | ||
| Ex-24 | Ex-115 | Ex-230 | |
| 24V DC | 115V AC | 230V AC | |
| Tolerance | +/- 15% | +/- 10% | +/- 10% |
| Power consumption approx. | 2.3W | 2.2VA | 2.2VA |
| galvanic isolation between
control circuit, measuring circuit and power supply |
375 Vs | ||
| Sign | [EEx ia] IIC | ||
| Confirmation of conformity | PTB No.
Ex-93.C.2020
ASEV 95.1 10889 |
||
| Max. values | |||
| Voltage Uo | 13.65 V | ||
| Current Ik | 200 mA | ||
| Internal resistance Rj | 68.3 ohms | ||
| Power Pm | 0.69 W | ||
| Max.permissible | |||
| external inductivity | 0.5 mH | ||
| external capacity | 170 nF | ||
| Switching output | Relay/1 change-over | ||
| Control circuit AC | |||
| Voltage Umax | 250 V | ||
| Current Imax | 4 A | ||
| Load cos | > or = to 0.7 | ||
| Control circuit DC | |||
| Voltage Umax | 60 V | ||
| Current Imax | 0.5 A | ||
| Load L/R | < or = to 50 ms | ||
| Ambient temperature | -20...60°C | ||
| Time delay-off adjustable | 0...25 s | ||
| Cable-break
monitoring sensor |
all wires | ||
| Short circuit
monitoring |
all wires | ||
| Connection | terminal screws | ||
| Setting range of the
flow velocity |
depends
on the
detection range of the connected sensors |
||
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