RKI M2A-NH3 (65-2648RK-NH3) Stand Alone Explosion Proof Transmitter (0 – 75.0 ppm)

Sensors: Electro-chemical

Measuring Ranges: 0 – 75.0 ppm

Resolution : 0.1 ppm

Lower Detectable Limit (LDL): 2% of full scale

Max Current Draw (24VDC): 125 mA with alarm 1 and alarm 2 active and all relays energized

Response Time (T-90): 60 Seconds or less

Life Expectancy: 2 to 3 years with normal service

Accuracy(which ever is greater): ± 10% of reading or ± 5% of full scale

Weather Resistant : Patented water repellent sensor coating

Alarms

Alarm Settings: Two fully programmable alarm set points, increasing / decreasing, latching /

self-resetting, on delays, off delays, normally energized or de-energized

Alarm Indication: Visual LEDs. Alarm 1, Amber; Alarm 2, Red; Fail, Red

Relays: 5 amp form ‘C’ contacts for alarm 1, alarm 2, and fail

Physical

Dimensions: Height: 8.5” (215 mm), Width: 5.2” (132 mm), Depth: 4.5” (114 mm)

Display: Alphanumeric OLED display. 8 characters per line;

2 lines for gas concentration readout, plus user-friendly calibration and setup

Enclosure: Explosion proof for Class I, Div 1, Groups B, C, D.

Enclosure Rating: NEMA 4X, explosion proof, watertight, cast aluminum with o-ring seal and epoxy powder coating

Controls: Magnet used for calibration functions. Calibrates without opening the housing.

Internal push-button controls also available for calibration and setup

Operating Environment

Operating Temperature: -4°F to 113°F -20°C to 45°C

Relative Humidity: 5 – 95% RH non-condensing

Location: Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, D.

Operating Voltage: 10 VDC – 30 VDC

Outputs

Analog: Linear 4-20 mA signal, into 1000 ohms impedance max (24DC), 0 – 500 ohms max (12VDC) corresponding to 0 – full scale

Digital: Modbus RTU output standard, fully configurable, 2-wire RS-485, 1200 to 19.2k baud

Controllers: Compatible with all RKI Beacon controllers, as well as most DCS / PLC systems: Beacon 110, Beacon 200, Beacon 410, Beacon 800

Datasheet