User Guide
Contents
1. RH La ZER Sensor Input RH TEMP Both relative humidity and temperature channels require DC supplies in the range of 12 to 32 volts nominal 24 volts Temperature connection unavailable on humidity only versions 52 214 2259 01 5 0 CHANGING THE FILTER 5 1 1 Low Temperature Version Only Remove protection cage from the probe stem as shown below by applying steady upward pressure to the sensor cage Remove and discard old PTFE filter Use a high grade 12mm wide PTFE tape lay onto a piece of paper to reduce the static effect cut off a 50mm length The PTFE tape is now fitted to the PTFE membrane to cover the sensor guard holes Apply light pressure rubbing the tape in the direction of the tape end joint Refit the sensor cage after the operation Probe Body Sensor Cage O F PTFE Tape Sensor Guard Membrane 5 1 2 High Temperature Version Only Remove filter retaining spring Remove old filter tape replace with a 40mm length of PTFE tape using method described in 5 1 1 Refit retaining spring 6 0 CALIBRATION CHECK FOR HUMIDITY RH The probe may be checked for correct operation if the need arises calibration capsules are required Check capsules are available With power applied to the probe affix the lowest value of capsule over the sensor cage leave for 60 minutes minimum then check the RH2. Response time 10 to 75 RH less than 10 secs for 90 of step change Output 4 20mA 2 wire 0 100 RH Temperature Sensor Pt100 Accuracy 0 3 C at 0 C Output 4 20mA 2 wire for 0 100 C General Ambient Operating Range 20 C to 55 C Electronics Head 5 95 non condensing Supply Voltage 10 30V DC Nominal 24V Output load maximum V supply 10 20 k ohms 4 0 INSTALLATION It is recommended that transmitters are not fitted into an installation until after the air distribution system has been running for an initial period of at least several hours This will permit the system to clear itself of contaminants and reduce the possibility of sensor contamination 4 1 1 Low Temperature Duct Mount Versions WARNING If duct temperatures are likely to exceed 50 C a stand off mounting should be used to avoid exceeding the rated temperatures of the electronic assembly Cut a 27mm diameter hole in the chosen position of the duct wall to allow the probe to enter the duct Make sure the probe does not foul the opposite wall of the duct Position the probe shaft through the 27mm aperture to it s full extent and with the cable gland of the electronics housing in the vertical downwards position note and mark the two fixing slots at the side of this housing The fixing slots are moulded at an angle to facilitate easier screwdriver access 4 1 2 Low Temperature Wall Mount Versions Position the transmitter at the d
3. 1 0 DESCRIPTION The low temperature version is suitable for monitoring in ducts or onto a flat surface and operates in the temperature range 25 to 80 C and 0 100 RH see section 3 0 for full specification The high temperature version is a stainless steel bodied probe that operates over the temperature range 30 to 140 C and 0 100 RH Two wire loop powered operation provides good noise immunity and economic site wiring Connection of the site wiring to the transmitter is via plug in screw terminals which are removable from the PCB for ease of wiring The sensor is fitted with a PTFE membrane filter around the sensor guard body to remove harmful dust and other airborne pollutants whilst allowing the moisture vapours to enter the sensing area of the probe The probe MUST NOT be operated without this filter in place WARNING PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE ATTEMPTING TO INSTALL THIS TRANSMITTER 2 0 HANDLING Handle the probe with care during installation the sensing element used to measure the humidity is of glass construction Although mechanically robust when permanently fixed into position it may be damaged if the probe is dropped or shocked in any way Sensor probes should not be mounted in positions in which they will be exposed to moisture contact e g rain Units being mounted outdoors should be fitted into suitable protective enclosures with an adequate air movement Sensors should not be exposed t
4. 4 20mA output using a current meter Adjust humidity ZERO pot if required Note The reading should be Capsule Value RH x 16mA 4mA Replace low value capsule for a high value capsule leave for 30 minutes and check the RH output signal Adjust the humidity SPAN pot if required repeat process until unit is within specification Remove power from the probe disconnect meter refit the probe into position 6 1 Calibration Check For Temperature C To check the calibration of the temperature the probe should be compared with a reference probe within a stable environment Slight inaccuracies can be corrected by adjusting the temperature zero pot If greater inaccuracies have occurred the unit should be sent back for re calibration MECHANICAL Low Temperature Duct Mount Versions 256 0 Low Temperature Wall Mount Versions 100 0 High Temperature Version 210 0 HUMIDITY amp TEMPERATURE TRANSMITTER Every effort has been taken to ensure the accuracy of this specification however we do not accept responsibility for damage injury loss or expense resulting from errors and omissions and we reserve the right of amendment without notice Stock code 52 214 2259 01 Issue 01
5. esired location with the sensor stem either horizontal or pointing downwards mid way between floor and ceiling Avoid the following locations Near to entrances exits or windows In direct sunlight or near room heating devices In direct line of air conditioning vents Remove the probe and drill the two marked positions to receive No 6 x 19 1mm self tapping screws As a guide in soft materials i e aluminium plastics wood etc a 2 5mm drill is recommended In harder and or thicker materials use a 3mm drill On duct mount devices the neoprene compression ring between the housing and the duct will give a good degree of sealing when the probe is fixed as recommended 4 1 3 High Temperature Version The high temperature version is supplied with a 4 BSP compression fitting which should be fixed to a suitable adaptor plate for mounting 4 2 WIRING The electronic housing contains the wiring terminals which are screw type clamps A maximum core size of 2 5mm can be accepted with an overall cable diameter of between 4 and 8mm Pass the cable through the cable gland of the probe and connect to the relevant terminals using small loops for each core to reduce strain on the PCB mountings The connecting terminals are removable from the PCB for ease of wiring see diagram in section 4 3 4 3 ELECTRICAL Connections are made to the two 2 way terminal blocks on the transmitter PCB as shown in diagram below GO
6. o humidity and temperature levels outside their specified operating ranges 3 0 SPECIFICATION Approvals EMC Emissions BS EN 50081 Susceptibility BS EN 50082 Mechanical Details Sensor filter PTFE Sub micronic Field replaceable Protection Head IP65 enclosure Connections Removable screw terminals Maximum wire size 2 5mm Recommended cable diameter 4 8mm Cable entry Compression type cable gland to IP65 Note The humidity sensor element may be damaged if it becomes contaminated the product warranty excludes the sensor element 3 1 Low Temperature Version Relative Humidity Sensor Capacitive 3 Version 2 Version Nominal Operating Range Sensor 20 95 RH 5 98 RH 40 to 40 C 40 to 60 C Extended Range Temperature lt 80 C lt 50 RH lt 75 RH Accuracy 3 2 Hysteresis lt 3 lt 1 Response time 10 to 90 RH less than 15 secs for 90 of step change Linearity 5 to 95 1 5 RH Output 4 20mA 2 wire for 0 100 C Temperature when fitted Sensor Pt100 Accuracy 0 3 C 0 C Output 4 20mA 2 wire for 0 50 C General Ambient Operating Range 20 C to 55 C Electronics Head 5 95 non condensing Supply voltage 10 30V DC 3 2 High Temperature Version Relative Humidity Sensor Capacitive Nominal Operating Range Sensor 0 100 RH 30 C to 140 C Operating Range for Full Accuracy 11 90 RH 20 C to 70 C Accuracy 2 5 Extended Range Temp lt 120 C lt 15 RH Hysterisis lt 1
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