ATEX Accelerometer Group I 4-20 mA Monitran MTN/M1187

Manufacturer: Monitran
Category: Accelerometers and Vibration Sensors, Amplified, ATEX, Group I – Mining, SENSORS

The Monitran MTN/M1187 is a general-purpose, top-entry accelerometer with a 4-20 mA two-wire output proportional to the RMS acceleration (g rms), for direct connection to PLCs, DCSs, and other controllers. It is ATEX and IECEx Group I certified for intrinsic safety (Ex ia I Ma); the datasheets cite intrinsically safe data collectors, oil and mining, and pumps, fans, and compressors as applications.

Stainless steel body with insulated base, IP67 rated, and integrated ETFE cable with stainless steel braid, with ¼" UNF female or Q/F female quick-release mounting base. Guemisa is an official distributor of Monitran in Spain.

Key points

Output 4-20 mA ∝ rms acceleration; ranges from 0-1 to 0-20 g rms
Frequency response: 2 Hz to 1 kHz ±10%; dynamic range 50 g peak
Power supply 12-32 V DC; ambient temperature −55 to +115 °C; stainless steel, IP67

BAS02ATEX0245XIECEx BAS 08.0013X

Group I Ambient temperature −55 °C ≤ Ta ≤ +115 °C

Intrinsically safe for mining (Group I, protection level Ma). Hover or click on each part of the marking to see what it means.

Mining (Group I)

Technical Frequently Asked Questions

For what environments is the Monitran MTN/M1187 certified?

For Group I (mining), with Ex ia I Ma marking, ambient temperature from −55 °C to +115 °C and BAS02ATEX0245X and IECEx BAS 08.0013X certificates.

Do you need an intrinsically safe barrier?

Yes. It connects to the PLC or control system via a barrier. The datasheet mentions the MTL787S (BAS01ATEX7217) and the P&FZ787 (BAS01ATEX7005), or any other barrier conforming to note 4 of drawing ATX009. Entity parameters: Ui = 28 V, Ii = 93 mA, Pi = 0.65 W.

Is it suitable for surface industry (Group II)?

No. The technical data sheets certify the M1187 only for Group I (Ex ia I Ma) and do not indicate Group II certification.

Properties

Feature	Specification
Measure and signal
Measured magnitude	Vibration acceleration, rms value
Exit	4-20 mA DC proportional to rms acceleration (g rms), 2 wires
Measurement ranges	0-1, 0-2, 0-5, 0-10 or 0-20 g rms
Frequency response	2 Hz to 1 kHz ±10%
Resonance of the mounted base	5 kHz (nominal)
Dynamic range	50g peak
Temperature sensitivity	0.08 %/°C
Cross-sectional sensitivity	Less than 5%
ATEX/IECEx Certification
Cluster	I
Marked	Ex ia I Ma
Certificates	BAS02ATEX0245X and IECEx BAS 08.0013X
Ambient temperature	−55 °C ≤ Ta ≤ +115 °C
Entity parameters	Ui = 28 V, Ii = 93 mA, Pi = 0.65 W; Ci and Li: see certificate
Food and environment
Feeding	12-32 V DC (4-20 mA)
Isolation	Isolated base
Protection	IP67
Mechanics and connection
Housing material	Stainless steel
Entrance	Superior
Mounting	¼" UNF female thread or Q/F female quick-release base
Dimensions	Ø27.0 mm × 43.0 mm high, 28 mm hexagon between faces
Tightening torque	8 Nm
Weight	150 g (nominal)
Connection	Integrated ETFE cable with stainless steel braid
Maximum cable length	See system diagram ATX009

Reference	Configuration
MTN/M1187IC-xx MTNM1187ICXX	Variant: M1187IC · Connection: Integrated ETFE cable with stainless steel braid · Mounting: ¼" UNF female · Top entry · xx = range 0-1, 0-2, 0-5, 0-10 or 0-20 g rms MTN/M1187IC technical sheet (PDF)
MTN/M1187ICQ-xx MTNM1187ICQXX	Variant: M1187IC · Connection: Integrated ETFE cable with stainless steel braid · Mounting: Female Q/F quick-release base · Top entry · xx = range 0-1, 0-2, 0-5, 0-10 or 0-20 g rms MTN/M1187IC technical sheet (PDF)

Installation in a hazardous area

Entity parameters

Ui: 28 V
II: 93 mA
Pi: 0.65 W
Ci and Li: View certificate

Barriers

MTL787S (BAS01ATEX7217) or P&FZ787 (BAS01ATEX7005), or any other barrier in accordance with note 4 of drawing ATX009.

Do not install in an atmosphere with high-speed airborne dust.

The parameters Ci and Li refer to the certificate; the sheet does not give their value.

Other products