The Monitran MTN/1187 is a general-purpose vibration accelerometer with a 4-20 mA two-wire output proportional to RMS acceleration (g), for direct connection to PLCs, DCSs, and other controllers. It is ATEX and IECEx Group II intrinsically safe (Ex ia) certified for zones 0, 1, and 2 (gas) and 20, 21, and 22 (dust).
Stainless steel body with top entry and integrated cable. Two variants: 1187IC, with ETFE cable with stainless steel braid and IP67 rating, and 1187IW, with polyurethane cable, IP68 rating, and submersible up to 5 m (0.5 bar). Guemisa is an official distributor of Monitran in Spain.
BAS02ATEX1057XIECEx BAS 08.0013X
Group II · Ambient temperature −55 °C ≤ Ta ≤ +65 °C
Intrinsically safe for gas (zones 0, 1, and 2) and dust (zones 20, 21, and 22). Hover or click on each part of the marking to see what it means.
In which areas can the Monitran MTN/1187 be installed?
In zones 0, 1 and 2 with gas (Ex ia IIC T6 Ga) and in zones 20, 21 and 22 with dust (Ex ia IIIC T85 °C Da), with an ambient temperature of −55 °C to +65 °C. Certified BAS02ATEX1057X and IECEx BAS 08.0013X, Group II.
Do you need an intrinsically safe barrier?
Yes. It connects to the PLC or control system via a barrier. The datasheets cite the MTL7787+ (BAS01ATEX7217) and the P&FZ787 (BAS01ATEX7005), or any other barrier conforming to note 4 of drawing ATX009 (1187IW: note 5 of drawing ATX031). Sensor entity parameters: Ui = 28 V, Ii = 93 mA, Pi = 0.65 W.
Is it suitable for mining?
No. The MTN/1187 is certified for Group II (surface industry), not for firedamp mines.
| 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 | II |
| Marking (gas) | Ex ia IIC T6 Ga |
| Marking (powder) | Ex ia IIIC T85 °C Da |
| Certificates | BAS02ATEX1057X and IECEx BAS 08.0013X |
| Ambient temperature | −55 °C ≤ Ta ≤ +65 °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; 1187IW: IP68, submersible up to 5 m (0.5 bar) |
| 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 and 28 mm between faces; 43.0 mm high (1187IW: 75.0 mm high) |
| Tightening torque | 8 Nm |
| Weight | 150 g (nominal) |
| Connection 1187IC | Integrated ETFE cable with stainless steel braid |
| Connection 1187IW | Integrated polyurethane cable with additional PTFE sheath (length to be specified in the order) |
| Maximum cable length | See system diagram ATX009 (1187IW: ATX031) |
| Reference | Configuration |
|---|---|
| MTN/1187IC-xx MTN1187ICXX | Variant: 1187IC · Top entry · Connection: Integrated ETFE cable with stainless steel braid · Mounting: ¼" UNF female · xx = range 0-1, 0-2, 0-5, 0-10 or 0-20 g rms MTN/1187IC technical sheet (PDF) |
| MTN/1187ICQ-xx MTN1187ICQXX | Variant: 1187IC · Top entry · Connection: Integrated ETFE cable with stainless steel braid · Mounting: Female Q/F quick-release base · xx = range 0-1, 0-2, 0-5, 0-10 or 0-20 g rms MTN/1187IC technical sheet (PDF) |
| MTN/1187IW-xx MTN1187IWXX | Variant: 1187IW · Top entry · Submersible to 5 m (0.5 bar), IP68 · Connection: Integrated polyurethane cable with additional PTFE sheath · Mounting: ¼" UNF female · xx = range 0-1, 0-2, 0-5, 0-10 or 0-20 g rms MTN/1187IW technical sheet (PDF) |
| MTN/1187IWQ-xx MTN1187IWQXX | Variant: 1187IW · Top entry · Submersible to 5 m (0.5 bar), IP68 · Connection: Integrated polyurethane cable with additional PTFE sheath · Mounting: Female Q/F quick-release base · xx = range 0-1, 0-2, 0-5, 0-10 or 0-20 g rms MTN/1187IW technical sheet (PDF) |
MTL7787+, BAS01ATEX7217 or P&FZ787, BAS01ATEX7005, or any other barrier according to note 4 of drawing ATX009 (1187IW: note 5 of drawing ATX031).
Do not install in a high-speed dust-laden atmosphere.
Group II: This equipment now has a higher internal capacitance (Ci) and internal inductance (Li) than in previous versions; the installer must take this into account when calculating the circuit.
1187IW: The polyurethane cable has an additional PTFE plastic sheath, with a surface resistivity greater than 1 GΩ·m, which poses a risk of electrostatic ignition.
The 1187IC datasheet does not indicate the standard cable length.
Eaton Zener Barrier, MTL7700 Series
Cited in the Monitran technical data sheet. Barrier data: Eaton specification sheet.
