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Micro-differential Pressure High-precision Digital Pressure Sensor [For Gas] DP-M (Discontinued Products)

Cautions For Use

  • Never use this product as a sensing device for personnel protection.
  • In case of using sensing devices for personnel protection, use products which meet laws and standards, such as OSHA, ANSI or IEC etc., for personnel protection applicable in each region or country.
  • The DP-M series is designed for use with non-corrosive gas. It cannot be used for liquid or corrosive gas.

Mounting

The displayed value may vary by 1 digit (0.01 kPa.D {1 mmH2O.D}) maximum depending on whether the sensor is installed vertically or horizontally.

  • A sensor mounting bracket MS-PE-1 (optional) may be used. When mounting the sensor with the sensor mounting bracket, the tightening torque should be 0.5 N·m or less.

Mounting

Conditions in use for CE conformity

  • The DP-M series is a CE conformity product complying with EMC Directive. The harmonized standard with regard to immunity that applies to this product is EN 61000-6-2 and the following condition must be met to conform to that standard.

Conditions
  • The sensor should be connected less than 10 m 32.808 ft from the power supply.
  • The signal line to connect with this sensor should be less than 30 m 98.425 ft.

Operation

  • If setting is impossible even with pressing the MODE key, verify whether the key-protect function is enabled. Please note that pressing down on the MODE key for an extended moment (for 4 sec. or more) will enable the key-protect function as soon as the key is released. The key-protect function is set when the display shows [ON] and is released when the display shows [OFF].
  • If using the window comparator mode, lower threshold value (M1) and upper threshold value (M2) should be set with a difference of 3 digits (0.03 kPa.D {3 mmH2O.D}) or more. No output will be possible with a 0 to 2 digits difference.

Piping

Apply higher pressure to the Hi-port and lower pressure to the Lo-port.

  • Use flexible tubes (silicone tube etc.) that can fit the pressure ports, ø4.6 mm ø0.181 in in diameter. The tubes should cover more than half the length of the pressure ports.

Recommended tube
  • TYGON® tube R-3603, size: internal dia 4 mm 0.157 in, external dia 6 mm 0.236 in, manufactured by Saint-Gobain K. K. Contact the manufacturer for details of the recommended product.

Piping Recommended tube

Notes:

1) TYGON is registered trademarks of Saint-Gobain K. K.
2) Ensure that excessive pressure is not applied to the pressure ports. Since this sensor is designed for detecting small pressures, if excessive pressure or shock is applied to the pressure ports, the diaphragm (pressure sensing device) in the sensor may get damaged.
3) Please do not compress the tube. If the tube is compressed, pressure exceeding the rated value may be generated, damaging the diaphragm (pressure sensing device).

Wiring

  • The analog current output of DP-M2A does not incorporate a short-circuit protection circuit. Do not connect it directly to a power supply or a capacitive load.

Functional description

Functional description
  Description Function
(1) 3 digit LED
display (Red)
The measured differential pressure level, setting values,
error codes, and key protection sign are displayed.
(2) M1 setting indicator (Red) Blinks in the lower threshold value (M1) setting mode.
(3) M2 setting indicator (Red) Blinks in the upper threshold value (M2) setting mode.
(4) Operation indicator (Orange) Lights up when the comparative output is ON.
(5) Pressure unit indicator
(mmH2O, kPa)
(Red)
The indicator of the selected unit lights up during the sensing mode.
Both indicators light off during the initial setting mode and during an error occurrence.
The indicator of the selected unit blinks during the upper and lower threshold value setting mode.
(6) Increment key
The settable digit is shifted cyclically at every press of the key during the initial setting mode.
Pressing the key increases the set value, in the upper and lower threshold value setting mode.
During the sensing mode, pressing both switches calibrates the sensor into atmospheric zero.
(7) Decrement key
The set condition changes at every press of the key during the initial setting mode.
Pressing the key decreases the set value, in the upper and lower threshold value setting mode.
(8) Mode selection key
Three modes, the sensing mode, the lower threshold value (M1) setting mode, and the upper threshold value (M2) setting mode, are cyclically selected at every press of the key.
During the sensing mode, pressing the key for 4 sec., or more, can make the key protection either effective or ineffective.
 
Holding the increment key and simultaneously pressing the mode selection key brings the sensor from the sensing mode to the initial setting mode.
(9) Pressure Lo-port Lower pressure should be applied.
(10) Pressure Hi-port Higher pressure should be applied.

Output mode and output operation

Hysteresis mode (H) (M1 < M2)

  • The lower threshold value and the upper threshold value establish the hysteresis of the comparative output.

Output mode and output operation Hysteresis mode (H)

Window comparator mode (C) (M1 < M2)

  • The comparative outputs can be made ON or OFF by a pressure within the limits set by the upper and the lower threshold levels.

Output mode and output operation Window comparator mode (C)
When operating in window comparator mode (C) lower threshold value (M1) and upper threshold value (M2) should be set with a difference of 3 digits (0.03 kPa.D {3 mmH2O.D}) or more.

Others

  • Use within the rated pressure range.
  • Do not apply pressure exceeding the pressure withstandability value. The diaphragm will get damaged and correct operation shall not be maintained.
  • Do not use during the initial transient time (0.5 sec.) after the power supply is switched on.
  • Do not insert wires, etc., into the pressure port. The diaphragm will get damaged and correct operation shall not be maintained.
  • Do not operate the keys with pointed or sharp objects.

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