Oldham OLCT 200, User Manual, Page: 17 / 80

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OLCT 200 User Manual | 17
Relays (Optional):
Three configurable form C (SPDT) relays rated for 5 amp at 30 VDC or 240 ~VAC
RESISTIVE.
Relay 1 and Relay 2 level alarms are configurable for HIGH or LOW trip, for normally
energized (Failsafe) or normally de-energized and for latching or non-latching.
Relay 3 is always normally energized for failsafe operation so loss of power to the
OLCT 200
will be indicated as a “FAULT” condition.
CAUTION: Relays are rated for RESISTIVE loads. Inductive loads, such contactor
coils or motors may cause contact arcing, which emits RFI into the sensor signals.
Use appropriate snubbers and MOV’s across inductive loads and keep wiring away
from signal wires.
Wireless Specifications:
900MHz Models 2.4GHz Models
Transmit (TX)
Power 30dBm at 1W power. Transmit
power may be set from 10mW
to 1W. 50mW
Receive (RX)
Sensitivity -100dBm -90dBm
Radio Frequency Hopping between 902
–
928MHz.
Hopping between 2.4
– 2.5
GHz
2.6 Field Wiring Installation
4-20mA Transmission Range Info:
The distance 4-20 mA signals can travel is dependent upon several factors including
the cable gauge, DC power supply voltage level and impedance of the input of the
receiving device. Assuming a nominal 24 VDC power supply, maximum total loop
resistance is 650 ohms in the 2-wire mode.
Note: WX16 Controllers have 4-20mA input resistance of 100 ohms.
2.6.1 2-Wire 4-20mA Intrinsically Safe & Explosion Proof Installations
OLCT 200
’s equipped with 10-0247 sensor heads are NRTL (Nationally Recognized
Testing Lab) certified as suitable for both intrinsically safe and explosion proof
installations. OLCT 200
’s equipped with 10-0247IS sensor heads (XP flame arrestor is
not installed to allow monitoring of highly reactive gases such as Hydrogen Chloride or
Ammonia) are NRTL certified as suitable for intrinsically safe installations. All OLCT
200
’s are NRTL certified for explosion proof installations as long as the sensor head is
CSA certified as explosion proof. Follow instructions on Installation Drawing # 11-0100
in section 2.6.2 for correct intrinsically safe installations.
Description:
The 2-wire current sinking transmitter is the easiest and most economical to install
since there are only two wires. All of the power needed comes from the current loop