Compound range pressure transmitters for measuring plus and minus pressures using the same device. Compound range transmittters are calibrated with the most negative reading at 4mA and the most positive reading at 20 mA.
Since the same sensing diaphragm is used to measure both the negative and the positive pressure, there is a limit to how great the ratio between positive and negative pressure can be, before the lower range of the two becomes too inaccurate. In the case of a -1 to 10 bar (-15 to +300 psi range which is accurate to 0.25%, will be accurate to only 2.5% over the vacuum range.
Gauge reference pressure transmitters can be configured to measure from -1bar (-15psi) which is approximately zero vacuum up to a positive pressure such +2 bar (+60psi). For ranges below 1 bar (15psi) the compounds range is typically bidirectionally symmetric such as -500 to +500 mbar, but it is also possible to provide ranges such as -200 to +500 mbar if required.
-760mmHg to +20 kg/cm² pressure transmitter with HART coms - Compound range transmitter for sensing pressure from -760 mm of mercury vacuum to 20 kilograms per sq cm positive pressure with HART communication.
Ammonia compatible -0.5 to +5 bar compound pressure transmitter - Ammonia compatible pressure transmitter for measuring a compound range -0.5 to 5 bar gauge with a 4 to 20 milliamp current loop output.- -10 to +5 psi compound range fresh water pressure sensor - Compound range pressure sensor with a negative pressure range of 0 to minus 10 psi g and a positive pressure range of 0 to plus 5 psi g.
+/- 30 inches of water compound range pressure transmitter - Compound range pressure sensor for measuring a negative & positive gauge pressure of 30 inH2O
DP sensor for -1 to 3 bar differential water pressure and 16 bar overpressure - I am looking for a 4-20mA output DP sensor with a -1 to 3 bar differential range for use on water. The sensor will need to withstand an overpressure of 20 bar on the positive side and 1.5 bar on the negative side.
Hastelloy diaphragm -100 to 50 kPa g range manometer - Small manometer device with membrane protected against corrosive material (chemicals) and which we would prefer to be covered with Hastelloy steel. 
Marine and IS approved, -1 to 3 mWG compound range pressure transmitter - Pressure transmitter with Marine type approvals and a compound pressure range of -1000 to +3000 mWG.
-1 to 10 bar ATEX pressure sensor - Compound range ATEX pressure sensor for measuring -1 to +10 bar gauge in a hazardous zone.
Solvent compatible +/-100mWG dp transmitter with PTFE seals - Differential pressure transmitters to use on Nitrogen and/or air containing low levels of flammable solvents.
Compound range -1 to 6 barg pressure transmitter & display - -1 to 6 bar gauge compound range pressure transmitter with 4 to 20 milliamp output signal, built-in loop powered digital display.
1000 pascal bidirectional range dry gas pressure transmitter - Compound range 4-20mA output pressure transmitter with a -1000 to + 1000 pascals gauge pressure range for use on dry gas.
15,000 Pa DP Transmitter with built-in digital display - Differential pressure transmitter with indicator for measuring -15000 to +15000 pascals.
