The MTLx526 enables two separate IS circuits in a hazardous area to be contact controlled by one or two, on/off, control signals in a safe area. Applications include the calibration of strain–gauge bridges; changing the polarity (and thereby the tone) of an IS sounder; the testing of IS fire alarms; and the transfer of safe-area signals into an annunciator with IS input terminals not segregated from each other. The output–relay contacts are certified as non–energy–storing apparatus, and can be connected to any IS circuit without further certification, provided that separate IS circuits are such that they would remain safe if connected together.
SPECIFICATION
See also common specification
Number of channels
Two, fully floating
Location of control circuit
Safe area
Input/output characteristics
Contact/Logic mode
(Inputs suitable for switch contacts, an open–collector transistor or logic drive)
| Relay energised if Relay de–energised if Loop powered mode Relay energised if Relay de-energised if |
< 450Ω or < 1V applied> 5kΩ or > 2V applied (35V max.) |
| >20V<17V |
Power supply failure protection
Relays de–energised if supply fails
Response time
25ms nominal
Contacts (suitable for connection to IS circuits)
1–pole changeover per channel
Contact rating
250V ac, limited to 40V dc for IS applications, 2A (reactive loads must be suppressed)
Contact life expectancy
2 x 107 operations at maximum IS load
Relay drive (see switch setting table)
Choice of "loop-powered" or "contact/logic" control, for both channels, by switch selection. A further switch option ("1in2out") enables either input, in contact/logic mode, to activate both outputs.
LED indicators
Green: power indication
Yellow: two: output status, on when relay energised
Power requirement, Vs
41mA at 20V dc 44mA at 24V dc 60mA at 35V dc
Power dissipation within unit
1.1W maximum at 24V
Safety description (each channel)
Non-energy–storing apparatus: relay contacts may be connected to any IS circuit without further consideration
User switch settings for operating mode
| Mode |
Function |
SW1 |
SW2 |
SW3 |
SW4 |
| Contact/Logic Input |
2 ch |
Off |
On |
On |
On |
| 1in2out |
On |
On |
On |
On |
| Loop Powered |
2 ch |
Off |
Off |
Off |
Off |
MTL4526
MTL552
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