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MVA Multivariable Analog Signal Splitter

MTS Multivariable Trip Switch

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Description  |   Benefits  |   Safety   |   How Works  |   Features  |   Ordering  |   Specs

Multivariable Trip Switch
for Smart Transmitters


The Multivariable Trip Switch (MTS) supplies a stand-alone safety shutdown solution that can range from simple shut-off of a pump or motor to part of a larger system solution. MTS works with Honeywell Smartline® field instruments or with any analog instrument to provide a configurable high or low trip. A second relay and one analog repeat output are optionally available.

The MTS is compatible with all Honeywell Smartline transmitters, including the SMV 3000 Smart Multivariable Transmitters, ST 3000 Smart Pressure Transmitters, SCM 3000 Smart Coriolis Mass Flowmeters, STT 3000 Smart Temperature Transmitters, the SGC 3000 Smart Gas Chromatograph, and MagneW 3000 and MagneW 3000 PLUS Smart Flowmeters. In addition, MTS works with any of Honeywell's DE control system interfaces (STDC, STI-MV). Honeywell's hand-held communicator, the SFC Smart Field Communicator, and the PC-based SCT 3000 Smart Configuration Toolkit may be used with no disturbances to the analog repeat output or status.

The MTS may be installed without disconnecting or disrupting the existing installation and may be used stand-alone or as an addition to an integrated control solution.

  • ZERO ERROR digital PV trip.
  • One model for DIGITAL or ANALOG inputs.
  • Secure bumpless digital communication.
  • Access to all variables .
  • Leverages wiring savings associated with multivariable transmitters.
  • Positive digital trip action avoids process upsets.
  • Independent transmitter status output differentiates a maintenance problem from a process problem.
  • Enables full digital, non-bumping communications for any application.
  • Increases analog accuracy 80% !
  • NO calibration or special configuration tools are required.
  • Allows elimination of Hi/Hi and Lo/Lo alarms.


The MTS provides a cost effective zero-error digital shutdown solution. The independent "smart status" output enhances the speed safety shutdown systems are able to respond by tracking the transmitter's status. "Smart status" also eliminates the need for separate Hi/Hi and Lo/Lo trips. The MTS fully supports forced I/O manual mode for validation testing of safety shutdown system. Multiple MTS s may be used with the same transmitter.

The MTS design has taken into consideration the emerging requirements of IEC 1508.


MTS monitors a single transmitter's digital PV/SV or analog signal and compares its value with the configured trip point. With a DE signal, MTS also provides an independent "smart status" derived from the digital transmitter's status and MTS module status. The "smart status" may be OR'ed with the PV/SV trip state.

The compact module design is suitable for DIN rail mounting and is intended to be mounted within an appropriate enclosure. MTS operates from a single +24VDC source and is internally short-circuit protected.


  • Trip on DE or ANALOG signals.
  • 0 to 99.9% trip range.
  • 1 or 2 relays, 5A @ 250VAC.
  • Independent transmitter status relay.
  • Optional analog repeat output with fail-safe low/high/LKG.
  • "Smart status" LED indicator.
  • Configurable forced I/O manual mode action.
  • Compatible with 4 or 6 byte DE protocol modes.
  • Modular DIN rail mount.
  • Test mode.
  • CE Mark and CSA


Trip Error 0 ±1.0%
Resolution 16 bits 8 bits
Hysteresis 0.25% 2%
Response Time 25 msec. 60 msec.
Analog Repeat Out YES NO
MV Capability YES NO
Indep Xmtr Status YES YES
SV Temp Capability YES NO
Bumpless Comm YES NO


MODELS:   MTS-102 (no analog repeat output)
                    MTS-112 (one analog output)

OPTIONS:  (contact our sales department)


# Inputs: 1
Input Types: DIGITAL: Honeywell DE, 4 or 6 byte, multivariable broadcast formats A thru F
ANALOG: 4-20mA. or 1-5 volts
Input (Loop) Loading: DE: 10 Kohms, min.
DE PV/SV Selection: PV1, PV2, PV3, PV4 or SV1 (switch configurable)
Trip Range: 0 to 99.9%, in increments of 0.1%, LOW or HIGH
Trip Error: DE input: Zero, Analog input: (1.0%
Trip Point Hysteresis: DE input: 0.25%, Analog input: 2%
Throughput Delay: DE input: 25 msec., Analog input: 60 msec., max.
Relay(s): 1 Form A and 1 Form B, 5A @ 30VDC, 250VAC, 0.1HP
Analog Repeat Output: [optional]

1 @ 1-5 volts, nom. ( 0.045% F.S., into 10 Kohms load, min. [higher accuracies available]

"Smart Status": Transmitter status, forced I/O manual mode, DE signal integrity, MTS test mode and MTS fault.
LED Indicators (5): HIGH, LOW, STATUS, RELAY, DE
Test/Validation Mode: Trips relays (de-energized), LEDs indicate BAD status, analog output forced to 3.00 volts
Field Communicator Interaction: DE input: No impact to trip state. PV/SV/Status may be delayed due to interleaved communications.
Power Supply: +18VDC to +30VDC, +24VDC nom. @ 80mA. typ (excludes transmitter)
Connectors: Screw type, compression, removable, keyed
Module Size: 4.51"(H) x 0.89"(W) x 3.9"(D)
Operating Temperature: 0°C to +60°C, ambient
Enclosure/Mounting: IP 20 / 35 mm DIN Rail (EN 50022) mounted equipment
Regulatory Approvals: CE Mark (Europe), CSA Certification (Canada), UL (USA)

Manufactured in the USA from US and imported parts.

Description  |   Benefits  |   Safety   |   How Works  |   Features  |   Ordering  |   Specs


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Smartline® Digitally Enhanced (DE) transmitters are a product of Honeywell Inc.