GENERAL INFORMATION

Transducers with a gage (relative) reference are vented to the atmosphere through a case vent hole that is protected with a vapor inhibiting material.

PRESSURE OVERLOADS
CAUTION
PRODUCT DAMAGE

  • Do not exceed the pressure overload rating.

Failure to comply with these instructions may result in reduced life, or electrical failure.

The MLH Series pressure transducers will withstand high overloads; however, if the overload rating is exceeded, the life of the MLH Series may be reduced and electrical failure may occur. Both static and dynamic overloads must be considered, particularly in hydraulic system applications. Hydraulic pressure fluctuations can have very high and very fast peak pressures, as in a water hammer effect.
An oscilloscope is recommended for determining if high pressure transients exist in a system. If system pressure pulses are expected, choose a transducer with a pressure rating high enough to allow continuous operation at the highest expected pressure spikes.
A pressure `snubber’ may be used to reduce the peak pressure applied to the transducer.

MEDIA COMPATIBILITY
CAUTION
PRODUCT DAMAGE

  • Use non-abrasive, chemically compatible media to prevent damage to the diaphragm or pressure port materials.
    Failure to comply with these instructions may result in product failure.

The MLH Series diaphragm and pressure port is an assembly of Haynes 214 alloy and 304L stainless steel.

INSTALLATION

CAUTION
PRODUCT DAMAGE

  • Use a hex wrench for installation. Never apply torque to the connector housing or the body of the transducer.
  • Do not subject the transducer to high temperatures from soldering, brazing, or welding of the system plumbing or operating environments above the specified maximum temperature.
    Failure to comply with these instructions may result in product damage.

Ratiometric voltage devices require a regulated 5.0 Vdc supply. All other versions can use an unregulated supply within the ranges noted under the excitation specifications. The power supply should be off while wiring.

ELECTROMAGNETIC ENERGY/NOISE

CAUTION
PRODUCT DAMAGE/ERRATIC OPERATION

  • Do not use in areas where electromagnetic energy may affect transducer operation.
    Failure to comply with these instructions may result in improper operation and/or product failure.

The MLH Series has been rated for high immunity to electrical noise; however, care should be taken when used around high voltage sources that emit high levels of radiated electromagnetic energy like variable frequency motor drives, solenoids, radio transmitters, and engine ignition systems. The use of shielded cable and grounding of pressure port is also recommended.

BENCH TEST
For incoming inspection or transducer failure evaluation:

  1. Connect the transducer to a dc voltage supply (off).
  2. Set the supply voltage to within the range specified for the model.
  3. Based on the transducer’s specified output, connect the output lead(s) to a digital dc or mA meter.
  4. With no pressure on the transducer, turn on the power supply and read the output signal on the voltmeter. The reading should correspond to the specification indicated for null offset. If not, check the connections, wire color code and the setting of the power supply.

WIRING INSTRUCTIONS

The wiring code for electrical connection is shown in Figure 3.

When using a connector, the use of the correct size wire is important to ensure environmental sealing. Fill all holes in the connector seal even if only two leads are used. Honeywell recommends using a crimping tool for crimping wires to the connector pins. Contact the individual connector manufacturer for mating connector wiring.

Table 1. Pressure Range Specifications1 (At 25°C [77°F] and at rated excitation unless otherwise specified.)

barpsl
Operating PressureProof PressureBurst PressureOperating PressureProof PressureBurst Pressure2
6186050150500
10301001003001000
16481601504501500
25752502006002000
40804002507502500
601206003009003000
100200100050015005000
16032016001000200010000
25050020682000400020000
35070020683000600030000
50075020685000750030000
550825206880001200030000

1 Comparable metric units follow same proof and burst specifications.
2 Bonded washer seal used on G 1/8 (DIN 3852-2) port is limited to 25000 psi burst.

Table 2. Electrical Specifications (At 25°C [77°F] unless otherwise noted.)

Output Signal
CharacteristicRatiometric
A
Current
B
Regulated
C
Regulated
D
Regulated
E
Regulated
G
Zero output0.5 Vdc4 mA1 Vdc0.25 Vdc0.5 Vdc1 Vdc
Full scale span (FSS)4 Vdc
(0.5 Vdc to 4.5 Vdc)
16 mA
(4 mA to 20 mA)
5 Vdc
(1 Vdc to 6 Vdc)
10 Vdc
(0.25 Vdc to 10.25 Vdc)
4 Vdc
(0.5 Vdc to 4.5 Vdc)
4 Vdc
(1 Vdc to 5 Vdc)
Excitation5 Vdc
(6 Vdc max.)1
9.5 Vdc to
30 Vdc2
8 Vdc to
30 Vdc2
14 Vdc to
30 Vdc2
7 Vdc to
30 Vdc2
8 Vdc to
30 Vdc2
Supply current4 mAtyp., 8 mA max.N/A5 mA typ., 17 mA max.5 mA typ., 17 mA max.5 mA typ., 17 mA max.5 mA typ., 17 mA max.
Source (nominal)1 mAN/A1 mA1 mA1 mA1 mA
Sink (nominal1 mA
at zero output
N/A1 mA
at zero output
1 mA
at zero output
1 mA
at zero output
1 mA
at zero output
Supply rejection ratio90 dB90 dB90 dB90 dB90 dB90 dB
Output impedance25 Ohm max.N/A25 Ohm max.25 Ohm max.25 Ohm max.25 Ohm max.

1 Maintains ratiometricity at 5 ±0.25 Vdc excitation. Product can tolerate 6 Vdc excitation without damage.
2 See Figures 1 and 2 for more information regarding maximum excitation voltage vs. operating temperature.

Table 3. Pressure Reference Types Pressure Reference

Pressure ReferenceDescription
Sealed gage1Output is proportional to the difference between applied pressure and a built-in fixed reference to 1 atmA, where the minimum operating pressure is set to 14.7 psiA (1 atmA).
Vented gage (relative)2Transducer measures pressure relative to ambient pressure. Output is proportional to the difference between applied pressure and atmospheric (ambient) pressure, where the minimum operating pressure is set to atmospheric pressure.

Table 4. Environmental and Mechanical Specifications (At 25°C [77°F] unless otherwise noted.)

Characteristic Parameter
Material in contact with media: port diaphragmstainless steel 304L Haynes 214 alloy
Housing materialblack plastic — Amodel AS-4133 HS — PPA
Weight (typical for Metri-Pack 150 and 1/8 N PT pressure port types)57.0 g [2.0 oz]
Shock100 g peak [11 ms]
VibrationMIL-STD-810C, Figure 514.2-5, Curve AK, Table 514.2-V, Random Vibration Test (overall g rms = 20.7 min.)
Compensated and operating temperature range: 0.5 Vdc to 4.5 Vdc ratiometric output all regulated and 4 mA to 20 mA outputs-40°C to 125°C [-40°F to 257°F]
-40°C to 125°C [-40°F to 257°F] (See Figures 1 and 2 for operating area details.)
Storage temperature range-40°C to 125°C [-40°F to 257°F]
ApprovalsRoHS, CE, UL Component Recognition for USA and Canada: File No. E258956

Table 5. Performance Specifications (At 25°C [77°F] unless otherwise noted.)

CharacteristicParameter
Response time<2 ms
Accuracy1:
>100 psi
<100 psi
±0.25 %FSS
±0.50 %FSS
Total Error Band2:
Vented gage (relative):
<300 psig
>300 psig
Sealed gage:
without L, M, P electrical connector types:
100 psis to 299 psis (-40°C to 85°C [-40°F to 185°F])
100 psis to 299 psis (>85°C to 125°C [>185°F to 257°F])
>300 psis (-40°C to 125°C [-40°F to 257°F])
with L, M, P electrical connector types:
100 psis to 299 psis (-40°C to 65°C [-40°F to 149°F])
100 psis to 299 psis (>65°C to 125°C [>149°F to 257°F])
>300 psis (-40°C to 65°C [-40°F to 149°F])
>300 psis (>65°C to 125°C [>149°F to 257°F])
±3 %FSS
±2 %FSS
±3 %FSS
±10 %FSS
±2 %FSS
±10 %FSS
±15 %FSS
±5 %FSS
±15 %FSS

1Includes pressure non-linearity (BFSL), pressure hysteresis and pressure non-repeatability. Thermal errors are not included.
2 Includes offset error, full scale span error, pressure non-linearity (BFSL), pressure hysteresis, pressure non-repeatability, thermal effect on offset, thermal effect on span, and thermal hysteresis.

Honeywell Heavy Duty Pressure Transducers MLH Series - Figure 1. Regulated Output Operating and Temperature Compensation

Figure 1. Regulated Output Operating and Temperature Compensation

Note: The dot indicates the maximum operating temperature of 125°C [257°F] with a 24 V supply.

Honeywell Heavy Duty Pressure Transducers MLH Series - Figure 1. Regulated Output Operating and Temperature Compensation 2

Figure 2. Current Output Operating and Temperature Compensation

Note: The operating area is extended with a 250 Ohm resistor. Higher loads extend the operating area. The dot indicates the maximum operating temperature when using a 24 V supply and a 250 Ohm resistor.

CAUTION
PRODUCT DAMAGE DUE TO MECHANICAL ISSUES

  • Ensure torque specifications are determined for the specific application. Values provided are for reference only. (Mating materials and thread sealants can result in significantly different torque values from one application to the next.)
  • When using mating parts made of stainless steel, use a thread sealant with anti-seize properties to prevent thread galling. Ensure the sealant is rated for the application.
  • Use appropriate tools (such as an open ended wrench or deep well socket) to install transducers.
  • Always hand-start transducers into the hole to prevent cross threading and damage.
  • Ensure that torque is not applied to the electrical connector.
  • Ensure that the proper mating electrical connector with a seal is used to connect the transducer. Improper or damaged seals can compromise ingress protection, leading to short circuits. Failure to comply with these instructions may result in product damage.

CAUTION
PRODUCT DAMAGE DUE TO PARTICULATES

  • Ensure that a filter is used upstream of the transducer to keep media flow free of larger particulates and increased humidity. All MLH Series transducers are dead-ended devices; particulate accumulation and condensing moisture may affect transducer output.
  • It is recommend that the transducer be positioned with the port facing downwards; any particulates in the system are less likely to enter and settle within the pressure transducer if it is in this position.
  • Ensure that the media does not create a residue when dried. Build-up inside the transducer may affect transducer output; rinsing of a dead-ended transducer is potentially difficult and has limited effectiveness in removing residue.

Failure to comply with these instructions may result in product damage.

Honeywell Heavy Duty Pressure Transducers MLH Series - Figure 4. Pressure Port Type Mounting Dimensions
Honeywell Heavy Duty - Table 1
Honeywell Heavy Duty - Table 2

Figure 3. Electrical Connector Type Mounting Dimensions (For reference only. mm/[in].)

1 IP rating is determined by the electrical connector type chosen.
2 Three-wire cable is required for ratiometric and regulated voltage outputs; two wire cable is required for current output.

Honeywell Heavy Duty Pressure Transducers MLH Series - Figure 1. Regulated Output Operating and Temperature Compensation 3

Figure 4. Pressure Port Type Mounting Dimensions (For reference only: mm/[in].)1

01
1/4-18 NPT
06
1/8-27 NPT
09
7/16-20 UNF 1/4 in 45º
Flare Female Schrader with depressor
Seal: Pipe thread
Mating geometry: ANSI B1.20.1-2013
Installation torque: 2 to 3 turns from finger tight
Honeywell Heavy Duty - icon 1
Seal: Pipe thread
Mating geometry: ANSI B1.20.1-2013
Installation torque: 2 to 3 turns from finger tight
Honeywell Heavy Duty - icon 6
Seal: 45º cone
Mating geometry: SAE J512
Installation torque: 20 Nm [14.8 ft-lb]
Honeywell Heavy Duty - icon 9
11
1/2-14 NPT
13
R1/4-19 (BSPT)
19
R1/8-28 (BSPT)
Seal: Pipe thread
Mating geometry: ANSI B1.20.1-2013
Installation Torque: 2 to 3 turns from finger tight
Honeywell Heavy Duty - icon 11
Seal: Pipe thread
Mating geometry: ISO 7-1
Installation Torque: 2 to 3 turns from finger tight
Honeywell Heavy Duty - icon 13
Seal: Pipe thread
Mating geometry: ISO 7-1
Installation Torque: 2 to 3 turns from finger tight
Honeywell Heavy Duty - icon 19
50
3/8-24 UNF (SAE J1926-2)
51
7/16-20 UNF (SAE J1926-2)
52
1/2-20 UNF (SAE J1926-2)
Seal1: O-ring
Mating geometry: SAE J1926-1
Installation torque: 10 N m [7.4 ft-lb]
Honeywell Heavy Duty - icon 50
Seal1: O-ring
Mating geometry: SAE J1926-1
Installation torque: 20 N m [14.8 ft-lb]Honeywell Heavy Duty - icon 51
Seal1: O-ring
Mating geometry: SAE J1926-1
Installation torque: 40 N m [29.5 ft-lb]
Honeywell Heavy Duty - icon 52
53
9/16-18 UNF (SAE J1926-2)
54
M10x1.0 (ISO 6149-2)
55
M12x1.5 (ISO 6149-2)
Seal1: O-ring
Mating geometry: SAE J1926-1
Installation torque: 45 N m [33.2 ft-lb]
Honeywell Heavy Duty - icon 53
M10x1.0 (ISO 6149-2)Seal1: O-ring
Mating geometry: ISO 6149-2
Installation torque: 20 N m [14.8 ft-lb]
Honeywell Heavy Duty - icon 54
Seal1: O-ring
Mating geometry: ISO 6149-2
Installation torque: 45 N m [33.2 ft-lb]
Honeywell Heavy Duty - icon 55
56
M14x1.5 (ISO 6149-2)
57
M16x1.5 (ISO 6149-2)
58
M18x1.5 (ISO 6149-2)
Seal1: O-ring
Mating geometry: ISO 6149-1
Installation torque: 45 N m [33.2 ft-lb]
Honeywell Heavy Duty - icon 56
Seal1: O-ring
Mating geometry: ISO 6149-1
Installation torque: 55 N m [40.6 ft-lb]
Honeywell Heavy Duty - icon 57
Seal1: O-ring
Mating geometry: ISO 6149-1
Installation torque: 70 N m [51.6 ft-lb]
Honeywell Heavy Duty - icon 58
59
M20x1.5 (ISO 6149-2)
60
G1/8-28 (BSPP) DIN 3852-2
61
G1/4-19 (BSPP) DIN 3852-2
Seal1: O-ring
Mating geometry: ISO 6149-1
Installation torque: 80 N m [59.0 ft-lb]Honeywell Heavy Duty - icon 59
Seal1: Bonded washer
Mating geometry with bonded washer:
DIN3852-1; 2000-11, large
Installation torque: 20 N m [14.8 ft-lb]
Honeywell Heavy Duty - icon 60
Seal1: Bonded washer
Mating geometry with bonded washer:
DIN 3852-1:2000-11, large
Installation torque: 50 N m [36.9 ft-lb]
Honeywell Heavy Duty - icon 61
62
G1/8-28 (BSPP) ISO 1179-2
63
G1/4-19 (BSPP) ISO 1179-2
Seal1: Elastomeric
Mating geometry: ISO 1179-1
Installation torque: 20 N m [14.8 ft-lb]
Honeywell Heavy Duty - icon 62
Seal1: Elastomeric
Mating geometry: ISO 1179-1
Installation torque: 50 N m [36.9 ft-lb]
Honeywell Heavy Duty - icon 63

1 Seal accessory included with transducer. Seal accessory material and specifications: O-ring (nitrile, durometer 90, temperature range -30°C to 125°C), bonded washer (steel outer ring with nitrile inner ring, temperature range -30°C to 125°C), elastomeric seal (nitrile, temperature range -30°C to 125°C).

WARNING
PERSONAL INJURY
DO NOT USE these products as safety or emergency stop devices or in any other application where the failure of the product could result in personal injury.
Failure to comply with these instructions could result in death or serious injury.

Warranty/Remedy
Honeywell warrants goods of its manufacture as being free of defective materials and faulty workmanship during the applicable warranty period. Honeywell’s standard product warranty applies unless agreed to otherwise by Honeywell in writing; please refer to your order acknowledgment or consult your local sales office for specific warranty details. If warranted goods are returned to Honeywell during the period of coverage, Honeywell will repair or replace, at its option, without charge those items that Honeywell, in its sole discretion, finds defective. The foregoing is buyer’s sole remedy and is in lieu of all other warranties, expressed or implied, including those of merchantability and fitness for a particular purpose. In no event shall Honeywell be liable for consequential, special, or indirect damages.

While Honeywell may provide application assistance personally, through our literature and the Honeywell web site, it is buyer’s sole responsibility to determine the suitability of the product in the application.

Specifications may change without notice. The information we supply is believed to be accurate and reliable as of this writing. However, Honeywell assumes no responsibility for its use.

For more information

Honeywell Advanced Sensing Technologies services its customers through a worldwide network of sales offices and distributors. For application assistance, current specifications, pricing or the nearest Authorized Distributor, visit our website or call:

Asia Pacific +65 6355-2828
Europe +44 (0) 1698 481481
USA/Canada +1-800-537-6945

Honeywell Advanced Sensing Technologies
830 East Arapaho Road
Richardson, TX 75081 sps.honeywell.com/ast
50010132-E-EN | E | 05/21
© 2021 Honeywell International Inc.
Honeywell logo

Documents / Resources

Honeywell Heavy Duty Pressure Transducers MLH Series [pdf] Installation Guide
Heavy Duty Pressure Transducers MLH Series

References

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