Ordering Information.

Meriam’s compact, new M1500 Digital Pressure Transmitters are ideal for pressure measurement needs from 10” H20 (pending) to 3000 PSI Full Scale. Output options include digital (RS-232, RS-485 and USB) or analog (mA or V DC). Chose from differential (dry/dry or wet/wet), gauge, compound or absolute pressure types – see info below for complete details.

Typical NIST traceable digital accuracy is ±0.025% of F.S. including all affects of linearity, repeatability, hysteresis and temperature from -20º to +50º C (-4º to +122º F). Digital output options for the M1500 deliver accurate pressure measurement to compatible receiving devices. Choose RS-232 single point or RS-485 for networks up to 255 devices. M1500 connections are made with a 7 position terminal block or DB-9 serial port. The USB digital communication option also powers the M1500 via high power USB ports or powered USB hubs.

Software is included for initial setup and support. Meriam Serial Protocol (MSP) or Modbus RTU protocol can be used to send and receive information.

Analog output options are also available. Output accuracy is typically ±0.035% of F.S. The user may configure the M1500 for 0 – 5 VDC or 4 – 20 mA output. Two SPST alarm switches are included. Analog units are configured using the RS-232 terminals and the included M1500 Measurement & Configuration Software. The software supports initial configuration, zeroing, recalibration and other functions. Meriam recommends Analog starter kit PN Z9P337 for first-time buyers.

NIST Traceable Accuracy:

• Digital: ±0.025% of Full Scale including all affects of linearity, repeatability, hysteresis and temperature
• Analog: ±0.035% of Full Scale including all affects of linearity, repeatability, hysteresis and temperature
• Temperature Spec.: Accuracy statements include all affects of temperature from -20º to +50º C (-4º to +122º F)
• Pressure Measurement Update Rate: 14 readings per second (consult factory for faster update rates)
• Engineering Units: 32 selectable pressure units plus two user units (pending)

Limits:

• DN sensors: 2x range when pressurized on P1 (HI) side only, 150 PSI when applied simultaneously to P1 (HI) & P2 (LO) sides.
• DI sensors: 3x range when pressurized on P1 (HI) side only, 3x range or 150 PSI (whichever is less) on P2 (LO) side only, 1000 PSI when applied simultaneously to P1 (HI) & P2 (LO) sides.
• GI, CI, AI sensors: 2x range

Media Compatibility:

• DN sensors: Non-isolated for clean, dry, non-corrosive gases only (Brass, 316L SS, Silicon gel)
• DI sensors: Isolated for fluids compatible with 316L SS and Viton®
• GI, CI, AI sensors: Isolated for fluids compatible with 316L SS

Output Options:
   1. Digital (use Meriam Serial Protocol or Modbus RTU Protocol)

• RS-232: 19200 baud (adjustable), 8 data bits, 1 stop bit, no parity
• RS-485: half duplex, 3-wire TR-1, TR-0, signal ground, 19200 baud (adjustable), 1 start bit, 1 stop bit, no parity. Multi-drop addressing for up to 255 devices (MSP) or 246 devices (Modbus RTU)
• USB: USB 2.0

   2. Analog

• 4 – 20 mA: 2-wire loop powered, 3-wire, 4-wire systems
• 0 – 5 VDC Analog: 3-wire, 1 – 5 VDC is user configurable
• Two SPST alarm switches, 80V DC, 100 mA maximum, 3-or 4-wire systems only

Connections:

• Pressure: 1/8” NPT (female)
• Electrical / Communications / Output
• Power: 7 position terminal block; 1.3 mm diameter holes for 16 – 25 gauge solid or stranded wire
  RS-232: DB-9 (female) Serial Connector or 7 position terminal block
  RS-485: DB-9 (female) Serial Connector or 7 position terminal block
  USB: USB type B female connector
  Analog: 7 position terminal blocks, two each

Power Requirements:

• RS-232, RS-485: 8 – 36 VDC, 20 mA minimum
• USB: high power (500 mA) USB port or USB hub (PC USB ports and USB hubs with power adapters are typically high power)
• mA, 2-wire: 15 – 36 VDC, 50 mA minimum
• mA, 4-wire: 8 – 36 VDC, 50 mA minimum
• V, 3-wire: 8 – 36 VDC, 50 mA minimum

Power Consumption:

• RS-232: 110 mW (maximum)
• RS-485: 110 mW (maximum)
• USB: 100 mW (maximum)

Certifications: CE (pending)