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RC SYSTEMS
PRODUCTS |
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ST-48 NON-INTRUSIVE MAGNETIC CALIBRATOR/SENSOR TRANSMITTER WITH SMART SENSOR INTERFACE
- Accepts 4-20mA, electrochemical and bridge style sensors into single or dual channels.
- ST-48Bridge model may accept one EC sensor and one bridge/4-20 input. Equipped with dual readouts and 4-20mA outputs.
- Wireless and 2-wire 4-20mA models for low power electrochemical sensors.
- “Smart” sensor interface allows sensor type, range, calibration and other variables be stored in sensor.
- Allows "one man" sensor calibration in hazardous areas without area declassification.
- Requires only a simple magnetic wand. No other special electronic devices are needed.
- LCD readout is .6” engineering units and graphically as a 30-minute trend or bar-graph.
- Five front panel alarm LED indicators for A1 , A2 , Fail, IN CAL & RS-485 are standard.
- Available options: A1, A2, Fail alarm contacts with RS-485 modbus, isolated 4-20mA, quick connect cables suitable for Div 2, wireless, magnetic mounting.
- 4-20mA output sends programmable "In Cal" signal during calibrations.
- User programmable "Power-Up" & "Post Cal" time delay locks output at zero during sensor stabilization.
- Standard "Fault Supervision" circuitry continuously monitors for failed sensor. 4-20mA output transmits low mA during Faults.
- Security mode allows locking of critical parameters.
- NRTL / ATEX certifications.
- NEMA 7 enclosure also available in stainless-steel.
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The popular ST-48 Sensor Transmitter is also available with integral RF900 (900MHZ) or RF2400 (2.4GHZ) license free radio modem options. Two wireless ST-48RF models are available:
ST-48EC/RF models accept only low power electrochemical toxic or oxygen sensors and an integral lithium 'D' cell provides up to one year continuous wireless operation.
ST-48Bridge/RF models must be powered from an external 10-30VDC power source but accept either electrochemical sensors or higher power consuming bridge sensors. These externally powered models also provide a 4-20mA output.
Wireless RF Interface Description:
RF900 or RF2400 radio modules mount in the ST-48's expansion PCB location. ST-48 options such as relays, modbus and isolated 4-20mA outputs are not available in wireless models. RF links consume much more power when communicating with the wireless network. To conserve battery power ST-48's keep the radio powered down until ready to transmit a message. Transmissions occur every 5-minutes when no alarms are detected and increase to each 6-seconds when alarms exist. Each transmission contains gas value, battery level and alarm status. Multiple R.C. Systems Inc. ST-71 / ST-90QUAD / ST-95 controllers may be positioned to receive ST-48 transmissions when one is Server, all others are Clients and all are on the same Hop and System ID patterns. RF900 and RF2400 equipped controllers only expect a response from each ST-48/RF every 5-minutes and flag "communication error" if three consecutive messages are missed.
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