Gas leak detectors, analyzers, alarm devices and calibration gas
ROSEMOUNT 56-02-20-38-HT
  • Overview
  • Benefits
  • Specs
  • Related
  • Literature

Rosemount Analytical 56 Dual Input Analyzer configured for Contacting Conductivity range 0-600,000 uS/cm (600 mS/cm). Display unit choices are conductivity, resistivity, total dissolved solids, salinity, and % concentration. Temperature compensation can be disabled, allowing the analyzer to display raw conductivity. Power 24 VDC with 4 alarm relays, HART digital communication comes standard, optional Profibus DP, 2nd measurement channel optional. Four actively powered 4-20 mA isolated current outputs. Approved for hazardous locations CE, FM, CSA, Class I Div 2 (Sensors NOT included)

Part# with Options:        56-02-20-38-HT
Price with Options:        Please Email us your request for quote   


(1) Power Options for Rosemount Model 56
Measurement 2
(2) Measurement 2 for Rosemount Model 56
(3) Comm options for Rosemount Model 56
(4) Pipe/Wall Mounting BrACKet for Rosemount 56 Analyzers
Cable Gland Kit
(5) Cable Gland Kit for Rosemount 56 Analyzers

  Availability 2 Weeks  ]

  • High resolution full-color screen easily viewed process measurements and on-screen data trend graphs
  • User help screens detailed instructions and troubleshooting in multiple languages
  • Data Logger and Event Logger Download process data and alarm conditions with time and date stamps via USB 2.0 data port
  • Control PID and time proportional capabilities. Also includes synchronized interval timers and four special application functions.
  • Digital Communications HART® and Profibus® DP communications with full features and functionality
  • Measurements pH, ORP, ISE, Resistivity/ Conductivity, % Concentration,Total Dissolved Solids, Total Chlorine, Free Chlorine, Monochloramine, Oxygen, Ozone, Turbidity, Pulse Flow, Temperature, and others via 4-20mA input from any device.
The Model 56 advanced analyzer supports continuous measurement of analytical inputs from one or two sensors. The modular design allows signal input boards to be field replaced, making configuration changes easy. The high resolution full-color display gives unsurpassed visibility and functionality for analytical instrumentation.

Full Color Display:The high resolution full-color display allows easy at-a-glance viewing of process readings – indoors or outdoors. Six additional process variables or diagnostic parameters are always displayed for quick determination of process or sensor condition.

Menus: Intuitive screens for easy configuration and calibration. Quick Start and all menu screens are available in multiple local languages. Alpha-numeric keypad allows easy entries during configuration and calibration.

Quick Start Programming: Simplified Quick Start screens appear the first time the unit is powered. The instrument autorecognizes each type of measurement board and prompts the user to configure each sensor loop in a few quick steps for immediate live readings.

User Help Screens. A complete user guide and trouble-shooting manual is embedded in the instrument’s memory and easily accessed via the INFO key on the keypad. Detailed instructions and troubleshooting tips are intended to provide adequate guidance to resolve most problems on site.

Local Languages: Rosemount Analytical extends its worldwide reach by offering nine menu languages – English, French, German, Italian, Spanish, Portuguese, Chinese, Russian and Polish. Every unit includes user programming menus; calibration routines; and faults and warnings in all nine languages. Modular, Scalable, Flexible: Slide-in measurement boards allow easy sensor wiring and configuration changes in the field. There are no limitations for measurement or communication configurations.

Device Security: Two levels of security access are available. Program one access code for routine maintenance and hold of current outputs; program another access code for all configuration menus and functions.

Diagnostics: The analyzer continuously monitors itself and the sensor(s) for fault and warning conditions. A display banner flashes red to indicate a Fault condition and yellow for a Warning condition to visually alert field personnel. Details and troubleshooting information for any specific fault or warning can be readily accessed by pressing the INFO key.

Current Outputs: Every unit includes four actively powered 4-20 mA or 0-20 mA electrically isolated current outputs giving the ability to transmit the measurement value and the temperature for both sensors. Users have wide latitude to assign any measurement value or live diagnostic to any current output for reporting.

Advanced Features

Process trending graphs: High-resolution color graphs of measurement data can be displayed on-screen to pinpoint process disruptions or measurement problems and to estimate probe maintenance frequency. The analyzer gives the user the ability to zoom in to a specific narrow timeframe of process measurements for detailed on-screen evaluation.

Process trends of any two measurements, temperature or live diagnostics

Data logger and Event Logger/Audit Trail: Extensive onboard data storage captures measurement data from both channels, including temperature every 30 seconds for 30 days for on-screen display or local upload to a USB 2.0 memory device. 300 significant analyzer events are recorded including start-up time, calibrations, hold outputs, configurations, alarms, power interruptions, faults, and more. All process data and events are time/date stamped.

USB 2.0: Local data transfer of process data and events using a standard USB memory device. Cleanly pre-formatted EXCEL data is useful for evaluation of process data on a computer and identification of critical alarm or fault events.

Advanced control: Any current output can be programmed for PID functions. Proportional, Integral and Derivative settings allow the analog current outputs to adjust a control device that has continuous adjustability. PID is typically used on modulating control devices such as automated control valves or variable speed pumps.

Alarm relay capabilities: Four SPDT alarm relays are fully assignable and programmable to trigger alarms upon reaching measurement, diagnostics setpoints, or fault conditions. Further relay settings include TPC, synchronized interval timers and four specialized timer functions described below. All relays are independently activated. Failsafe operation and programming of relay default state (normally open or normally closed) is software selectable.

Timer functions: Four real-time clock relay functions are implemented including: bleed and feed, day and time interval timers, delay timer and a flow totalizer. These advanced timer features support a number of specialized applications that normally require dedicated timer control devices or DCS programming. Interval timers set relays by interval time, on-time and recovery time for discrete on/off control devices based on measurement inputs.

Digital Communications: HART version 5 and 7 digital communications are available on Model 56. An optional Profibus DP digital communications board is available for Profibus installations. HART and Profibus DP configured units will support any single or dual measurement configurations of Model 56.

HART and optional Profibus DP

Wireless THUM Adaptor compatible: Enable wireless transmissions of process variables and diagnostics from hard-to-reach locations where it is impractical to run wires for current outputs. When commissioned with the THUM Adaptor, Model 56 HART units can communicate on Emerson wireless networks using HART 7 wireless protocol.

SMART-enabled pH: Rosemount Analytical’s SMART preamplifier pH capability can eliminate field calibration of pH probes through automatic upload of calibration data and history – fully calibrating the pH loop. pH probe changes are literally “plug and play” using SMART pH sensors with VP cables connections.

Enclosure: The instrument enclosure fits standard 􀀀 DIN panel cutouts. The versatile enclosure design supports panel-mount, pipe-mount, and surface/wall-mount installations. Enclosure ratings.

Supports other Advanced Features:

  • High reference impedance pH sensors
  • Ion Selective Electrode measurements
  • pH loop calibration by entering pH slope and reference offset
  • Inferred pH determination using dual contacting conductivity inputs
  • Differential conductivity
  • Differential flow and Totalized flow
  • Current input from any 4-20mA source
  • Dual range calibration for chlorine sensors
  • Programmable polarizing voltage for amperometric oxygen sensors
  • Extended high-end conductivity range for contacting conductivity sensors
  • Extended low-end conductivity range for inductive conductivity sensors
  • Noise immunity to high RF or line noise environments
  • Linear or logarithmic setting for current outputs
  • Scalable and assignable onscreen trend graphs
  • Pre-formatted EXCEL data tables from USB downloads
  • Current outputs assignable to any live parameter or diagnostic
  • Optimized and programmable input filters


  • Cooling Towers
  • Boiler Blowdown
  • Reverse Osmosis
  • Ion Exchange
  • Boiler Feedwater
  • Wastewater
  • Fermenter/Bioreactor
  • CIP (Clean in Place)
  • Drinking Water
  • Ultrapure Water/Semiconductor
  • Pulp and Paper
  • Leak Detection
  • Wet Scrubbers

Case Polycarbonate.
Dimensions 6.2 x 6.2 x 5.2 in. (157 x 157 x 132mm)
Display Large 3.75 x 2.2 in. (95.3 x 55.9mm) high resolution color LCD displays large process variables and user-definable display of diagnostic parameters. Calibration, programming and information screens display clear, easy-to-read characters. The color display is back-lit and backlighting intensity is user adjustable. Measurement character height: (.5") 13mm. Main display can be customized to meet user requirements.
Ambient temperature and humidity:

-10 to 60°C, (14 to 140°F) RH 5 to 95% (non-condensing). For Turbidity only: 0 to 55°C (32 to 131°F). RH 5 to 95% (non-condensing).

Note: Some degradation in display response or performance may occur below -5°C (23°F) and above 55°C (131°F). Above 60°C, the following components will progressively and automatically shut down: display, USB communications port, current outputs, alarm relays, main circuit board.

Storage temperature -20 to 60°C, (-4 to 140°F)

Code -02: 20 to 30 VDC. 20 W

Code –03: 85 to 264 VAC, 47.5 to 65.0 Hz, 20 W

Real time clock back-up 24 Hours
RFI/EMI EN-61326
Hazardous Location Approvals

Options for CSA: -02, 03, 20, 21, 22, 24, 25, 26, 27, 30, 31, 32, 34, 35, 36, 37, 38, HT and DP. Class I, Division 2, Groups A, B, C, & D Class Il, Division 2, Groups E, F, & G Class Ill T4A Tamb= 50°C Evaluated to the ANSI/UL Standards. The ‘C’ and ‘US’ indicators adjacent to the CSA Mark signify that the product has been evaluated to the applicable CSA and ANSI/UL Standards, for use in Canada and the U.S. respectively

Options for FM: -02, 03, 20, 21, 22, 23, 24, 25, 26, 27, 30, 31, 32, 33, 34, 35, 36, 37, 38, HT and DP. Class I, Division 2, Groups A, B, C, & D Class Il & lll, Division 2, Groups E, F, & G T4 Tamp = -10 deg C to 60 deg C.

Options for UL: -02, 03, 20, 21, 22, 24, 25, 26, 27, 30, 31, 32, 34, 35, 36, 37, 38, HT and DP.

Pollution Degree 2 Normally only non-conductive pollution occurs. Occasionally, however, a temporary conductivity caused by condensation must be expected. Altitude: for use up to 2000 meter (6562 ft.)
Input One or two isolated sensor inputs. Measurement choices of pH/ORP, resistivity/conductivity/TDS, % concentration, ratio conductivity, total and free chlorine, monochloramine, dissolved oxygen, dissolved ozone, turbidity, pulse flow, temperature and raw 4-20mA input. For contacting conductivity measurements, temperature element must be a Pt1000 RTD. For other measurements (except ORP, flow and turbidity), use either a PT100 RTD, PT1000 RTD, or 22k NTC (D.O. only).
Outputs Four actively powered 4-20 mA or 0-20 mA isolated current outputs. Fully scalable. Max Load: 550 Ohms. Outputs can be programmed for PID control. Output dampening can be enabled with time constants from 0 to 999 seconds. HART digital communications which is superimposed on output 1 is standard on all units (option code –HT).

Four alarm relays for process measurement(s) or temperature. Any relay can be programmed for any measurement, timer, TPC or fault alarm operation, instead of a process alarm. When selected, a fault alarm will activate the relay when a sensor or analyzer fault occurs. Each relay can be configured independently. Alarm logic (high or low activation or USP*) and deadband are user-programmable.

*USP alarm can be programmed to activate when the conductivity is within a user-selectable percentage of the limit. conductivity/resistivity measurement only)

Relays Form C, SPDT, epoxy sealed, 5 Amps
Inductive load 1/8 HP motor (max.), 115/240 VA
Weight/Shipping Weight 3 lbs/4 lbs (1.5 kg/2.0 kg)

    400-11 Rosemount ENDURANCE Model 400 General Purpose Conductivity Sensor for the determination of electrolytic conductivity in applicationsranging from high purity water to clean cooling water for use in clean, non-corrosive liquid havingconductivity less than a ..

    3900-02-10 Rosemount General purpose pH/ORP sensor model 3900 Range: pH: ACCUGLASS 0-14 or ORP: -1500 to +1500 mV with integral cable, molded PPS body chemically resistant, does not require electrolyte (KCl) replenishment or any high maintenance troubleshooting proc ..

B2B Checkout Options: Designated Carrier and Tax-Exempt purchase
Payment Options: Credit Card, Credit Card Over the Phone, PAYPAL, Wire Transfer, Check and Money Order

Checkout with Paypal