RHE 21

Ex d Field Mount

An advanced function, explosion proof, field mount transmitter. With a corrosion resistant stainless steel enclosure and through-glass operation capability, the RHE 21 is rated to IP67 and suitable for the most extreme of installation environments. Features such as API Standard Volume correction and Net Oil calculation are available.

  • Measure Mass Flow, Volumetric Flow, Density and Temperature
  • Outputs 2 x Analog, 2 x Frequency/Pulse, 2 x Digital Status
  • Inputs 2 x Digital, 1 x Analog
  • PC USB for RHECom, RS 485 for Modbus RTU, HART over Analog
  • Backlit Color LCD
  • ATEX/IEC Ex, CSA approved
  • Rheonik Assurance Factor®

CONFIGURE

General Specifications

Enclosure Material

Stainless steel. Optionally all 316L stainless steel

Enclosure Rating

IP66 / NEMA 4X

Ambient Temperature:

-40 to +60°C / -40 to +140°F (reduced visibility below -20°C / -4°F)

Dimensions:

Depending upon construction type, please see Dimensions page

(approx. 255 x 200 x 100 mm / 10 x 8 x 4 in)

Display:

Backlit color LCD.  Screen changes color to indicate warning or error

Weight:

8 kg (17.5 lb)

Operation

3 x behind-window capacitive buttons for menu navigation / settings

Sensor Connection:

Integral sensor cable with 3m or 10m length or optional IS terminal box for separate custom length sensor cable connection

Analog Outputs

Up to 2 x 4–20 mA outputs, active or passive

Intrinsically safe versions available

Uncertainty of analog outputs ±0.1% of reading, ±10 µA

All analog outputs acc. to NAMUR NE43

Digital Outputs:

Up to 2 x configurable status outputs (IEC60946)

Intrinsically safe versions available

Pulse/Freq/Status Outputs

Up to 2 x configurable pulse/frequency/status outputs (IEC60946), max. 10 kHz

Digital Inputs:

Up to 2 x configurable control inputs (IEC60946)

Analog Input (optional):

1 x 4 - 20 mA analog input (active) for two-wire external sensor

Power Supply

100–240 VAC (48 to 62 Hz), 5 W and/or 12–24 VDC ±10%, 4 W

Digital Data Communications

Modbus RTU (RS485)

Connection to PC (USB) with Rheonik RHECom software

HART over analog output

Cable Entries for Power and I/O

Two M16 x 1.5 entries with Ex e glands for 4–11 mm cables (standard)

Optional ½″ NPT, ¾″ NPT, M20 x 1.5 or M25 x 1.5; versions with two ½″ NPT entries are also available (see datasheet)

Hazardous Area Approvals

ATEX / IECEx and cCSAus (see datasheet)

Others available on request

Sensor and transmitter must have matching approvals (see datasheet).